Question about 1992 GMC Sonoma

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92 GMC EXT Cab chugs after it warms up

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.

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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.

Posted on Apr 17, 2009

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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.

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