4.3 Bucking

[carterroberts1]

I've replaced all the fuel system and I've cleaned the TBI but I still am bucking at any constant speed after going for like 5 min. Does anyone know what is going on? Any help would be appreciated.

 

[Schurkey]

Could be fuel system. Could be ignition. Both are controlled by the computer based on sensor data, and actuator operation.

Verify fuel pressure.

Assure all the "tune-up" parts and procedures/adjustments are serviceable and right--cap, rotor, plug wires, spark plugs, PCV system, initial spark timing and electronic spark advance, charcoal canister/vent system, EGR system, heated air intake system, etc.

Connect a scan tool, verify EVERY sensor and computer output, plus fuel trims.

 

[carterroberts1]

My obd1 connection does not work. Im going to have to rewire it.

 

[carterroberts1]

I figured it out. I was my egr valve. I unplugged it and my engine hasn't had an issue since.