I have replaced the fuel pump , the sending unit and fuel filter, but once the truck gets just past the warm on the temprature gauge it starts to chug leaving from a dead stop. I have to feather the gas pedal to leave a stop sign and it seems to surge on and off once im moving.
Its the EGR valve. My personal solution was just to disconnect the vacuum line from the EGR solenoid. Take the breather off. Looking at the motor from the front of the truck, look to the left of the throttle body(injectors) and find a small electronic device with two vacuum lines attached to it. Take the vacuum line on the very back and unplug it.
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I had the exact problem with my 1993 chevy c1500. I found that the IAC was sticking so the engine would die at idle after warming up and the ignition module was pulsing the ECM intermittently after the engine warmed up so the fuel pump wasn't being turned on after the engine died....I replaced the ignition module and the IAC valve and all is good. I don't know if testing the ignition module reveals that it isn't sending pulses to the ECM.
If your oil pressure gets to low it can turn off the fuel pump. This may also have saved your engine. The ECM turns on the fuel thru the fuel pump relay for about 5 seconds. When engine is running oil pressure sender supplies the voltage to the pump. When engine shuts off check oil pressure and voltage to fuel pump.
Probably MAF. Mass air flow sensor, or idle control system/ sensor.
I have actually heard of some people having this problem because of a faulty heat sending unit, which doesn't show up on scan, but i'm still betting on the MAF. Good luck, let me know what you find.
where did you get the pump replaced?a dealer or local garage There are 2 pumps for the jimmy one for a plastis tank which is an 18 gal and one for a metal tank which is a 19 gal.if the jimmy has a metal tank get the 19 gal pump . i ran into the same problem with my 98 jimmy
sending unit on the fuel pump in the tank is stuck, and needs to be replaced. its expensive, but that will fix your issue. its the housing around the pump that has the float arm on it. you can try to free the float arm by removing your pump assembly, but cant guarantee its any good after being stuck