88 dodge ram 50 318 holley throttle body fuel injection carburetor starts but stalls within minutes I have changed fuel pump, map sensor, throttle body sensor, complete tune up. Any ideas why it wont stay running?

what fuel injection system does it have ? throttle body or multi-port injection . Does it have a mass air flow sensor or map sensor ? You would save yourself a lot of time an money if you learned how to diagnose instead of being a parts changer

Questions here are better with full 'year make model' instead of generic '318'.

A few generic ideas.

1. Check fuel pump pressure.
2. Run injector cleaner through the fuel system 'Extreme Clean' is a good one.
3. Clean the throttle body.
4. Does it have a MAF (mass air flow sensor)?

More ideas here

https://www.google.com/search?q=1989+Dodge+318+stalls+and+surges+when+starting

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This generation of Caravans had a problem with the fuel injection wiring harness.
The problem is excessive heating of the harness and the poor quality of the insulation on the individual wires located within the harness. The spot to check is located where the engine FI harness plugs into the body fi harness just behind and below the ign. coil.
It is located near the exhaust crossover and once repaired should be relocated.
Examining the harness will not revel the deteriorated wires located within the harness. You must cut open the outer harness covering on the engine side of the connector to see the wires and make the repairs.
Sometime you can re-insulate the individual wires with tape but it's best to replace the engine FI harness and it's not hard to do.
Ebay sells the harness for about 125/150 bucks.
Gabe...

You do not have a carburetor. It is a throttle body injection system. The coolant temperature sensor, oxygen sensor, map sensor and throttle position sensor all have to do with the fuel delivery. The ECM (computer/brain) collects information from these sensors and adjusts the fuel accordingly. Hold the throttle wide open and try to start it. Have your diagnostic codes read and make sure you put in the correct ECM for your vehicle. Check your fuel return line and your air filter.

I’m happy to assist further over the phone at https://www.6ya.com/expert/kim_3202917d7c587455

I would check the voltage on the throttle portion sensor with the engine off from idle to wide open throttle.If there are any dead spots, replace the sensor. If the tps checks out, you should check fuel pressure. If you have good fuel pressure, you may want to make sure there isn't a lot of slack in your timing chain. I don't believe you mentioned the mileage of your vehicle. Best of luck.

Yea , those crossfire injection vettes can be a bear sometimes . I had dealings with them 84-85 - 86 working as a tech at a chevy dealer . Don't remember much about them , haven't heard anything about them for long time .

How's the fuel pressure ? Have you put a fuel gauge on it ? I would imagine you don't have a Tech 1 scan tool ? What's the map sensor voltage at idle ?

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may not be a fuel issue. maybe senor problem. first check the map sensor and make sure you have good engine vacuum going to the map sensor.if the map test good , check the tps voltage.

If your truck has a multiport fuel injection system then crank sensor is located on the top of the bell housing on the passenger side. If your truck has carburetor or throttle body injection then your truck doesn't have a crank sensor.

it may be your throttle position sensor (TPS) or you may need new fuel injectors

The throttle position sensor should be located on the side of the throttle body or on the fuel injection pump. If it is one of the models on the throttle body it will be attached at the end of the throttle shaft. If the engine is setting code 24 and idles erratically that is the problem. If it is setting a different code tps is not the problem