2002 Dodge Dakota 6 cyl.replaced plugs ditribitor cap and rotor cap oxy sensors and heat sensors at cat converter motor starts fine when i step on the gas motor bogs down code reader says PO300 misfire,PO303 misfire #3,PO455 evap large leak,PO305 misfire #5,PO442 evap small leak.Cant drive on road no high end power

oxygen sensors ( O2S) are located after the cat converter/s
heated oxygen sensors (HO2S) are located in the exhaust manifold/s before the cat converters
so on a 4cyl/in line 6 cyl engine --1 of each
on a v6/v8 --2 of each

depending on the engine make
v8 and v6 have 2 oxygen sensors( O2S) , one after each cat converter with 2 wires and 2 heated oxygen sensors ( HO2S) in the exhaust manifold/ pipe before the cat converter with 4 wires each
6 cyl and 4 cyl engines have one oxygen sensor after that cat converter and one heated oxygen sensor before the cat converter

Check your repair manual for ECM voltage and signals! There is no communicatiin between the the ECM advance and the engine beyond idle..........

You need to run a fault code test on the ECU. here is how you do that.

Try switching the ASD Relay for another relay in the Fuse Box in the Engine Compartment. If the ASD Relay fails it cancels the power to the Hall Effect & Fuel Pump.
If that doesn't change anything, check the wiring harness that travels down the left wheelwell for damage, It actually goes outside of the engine compartment, into the wheelwell where it can be damaged by rocks, road debris or a tire (if you've flexed the suspension, or had the truck off road). If the wiring there checks out, it leaves one other thing.
The Hall Effect Sensor inside the Distributor.

check your catalytic converter for clogged up.
disconnect the exhaust pipe before the cat and run the engine to see if it still cut off.
if it run better, then that's the problem

Check this 1998 Dodge Dakota 2WD 3.9 liter V-6 VIN "X"



Good luck.

replace the air filter,pcv valve and spark plugs if over 60 k and the wires are original replace dist cap rotor and wires also then clean the throttle bore spotless with cab cleaner and a rag scan for any codes and sensors out of range there is no fuel filter (it is part of the fuel pump)

You can rotate the engine until #1 piston is at top dead center when it has the rotor on the distributer will point at the #1 on the cap.

this may be a defective fuel injector or a defective PCM (powertrain control module).