Error code p1296. vehicle has been randomly stalling when accelerator not depressed. wait about 5 minutes and will restart. HAVE changed fuel filter, cap, rotor, plugs, wires. when it stalls it does have fuel pressure at fuel rail

Likely an improper air/fuel mixture. You need know the fuel trim values plus multiple inputs e.g. MAF, temp, fuel pressure, up/downstream O2s, etc. As it appears bank related, look for bank related vacuum leak, O2, or cat.

I doubt they did a 'tune up' at all. you only replace a fuel pump when it has failed. And fortunately for them, you can't see if it has been changed because it is inside the fuel tank. As my old dad used to say "they saw you coming", meaning you got fleeced because you are female. Put this on your car, leave it there. It talks to your smartphone and you can even reset codes. The Catalytic converter one is not critical, but the overheating is.

https://www.fixd.com/

P1296 is a coolant overheating code.

P1296 VOLKSWAGEN code possible causes - Engine-Codes ...

https://www.engine-codes.com > p1296_volkswagen
'P1296 VOLKSWAGEN code possible causes · Low engine coolant level · Faulty Engine Coolant Temperature (ECT) sensor · Faulty engine coolant thermostat · Engine ...

and your P0420 code is the Catalytic Converter code you originally went for.

P0420 VOLKSWAGEN Code - Catalyst System Efficiency ...

https://www.engine-codes.com > p0420_volkswagen
As the code description implies the P0421 code means that the vehicle's control module has detected that the three-way catalytic converter is not working ...

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Check the EVAP system canister purge valve, usually located on or near the canister itself which should be near the fuel tank. If the valve is clogged or stuck, it will cause excessive backpressure in the vapor return system, which sounds like what is happening here. Good luck, hope this helps.

try replacing fuel filter , and next time you go to start it turn key on let it sit for count to 50 then start see what happens

ENGINE HESITATES WHILE ACCELERATION

LOSS OF ACCELERATION

It can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.

There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------

Jerks and Hesitates During Acceleration?

http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html

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Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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Headlights flickering and car hesitates to start?

http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

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How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

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2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html

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Wheel hop under hard acceleration?

http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

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2009 Chevy impala accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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These details will help.

Thanks.

Are the any trouble codes being activated from this occurring?

And can you monitor the fuel rail pressure with it faulting? All you need is an obd reader to do this.

Could be a whole range of problems, but it is most likely a fuel pressure fault.

Do you service the vehicle yourself, the stored and self learned parameters for the high presure fuel pump need to be reset evey time after you change the fuel filter, or it will have incorrect values.



To clear the codes from your ECM do as follows;

Set Diagnostic Test Mode II (Self-diagnostic Results)

1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIl starts
blinking.
4. Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).

To Erase Diagnostic Test Mode II (Self-diagnostic Results)

1. Set ECM in Diagnostic Test Mode II (Self-diagnostic results).
Mode II (Self-diagnostic Results)" .
2. Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.
3. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

Or in short
Ign on count to 3
full on and off throttle 5 times within 5 sec's
count to 7 hold throttle down for 10 or so seconds
wait for the ECM light to flash let go of throttle and your in count the codes after you have written them down or fell you don’t need any codes just hold the throttle down until you see the ECM pattern change to ten fast flashes twice and then ten slow flashes and there you have one reset ECM

Hope this gets you somewhere.

sounds like a fuel problem. check or replace fuel filter, and then go from there to find problem. have a good day !!

not near enough fuel pump pressure,should be 45 lbs

possible fuel pump. Try spraying starting fluid into breather while someone is cranking engine. if vehicle tries to run it is fuel problem. If not it could be an electrical componet overheating and cooling and restarting. Coils, relays, ecm.