Question about 1996 Chevrolet K1500

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Chevy 1/2 ton 2wd 4.3 vortec rough idle tried everything I know

Checked all sensors and changed out fuel pump (wouldn't start otherwise). Engine surges but drives ok @ driving speeds (except tranny won't shift into 3rd gear). The only thing I haven't tried is draining out the old gas - it smells terrible and refilling.

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  • BummyC Oct 10, 2008

    Nope I got it from Autozone...

  • Anonymous Nov 11, 2008

    I had this same problem with my 96 half ton 4.3. It idled rough enough to shake the truck at idle with it in gear. It also had a hard time staying in overdrive because it did not run properly at a low rev. I tried the cap and rotor and tune up but what it actually turned out to be was the intake gasket. The side intake gaskets were corroded near the back of the engine causing a vacuum leak. You can't see this until you have the intake off.

  • BummyC Nov 12, 2008

    The surging problem was caused by the #2 and #4 spark plug wires being crossed... now it just idles really high. Thinking of changing the air idle control valve. If anybody knows about my tranny issue (won't shift to 3rd and it does, there's nothing there) please help. I changed out the shift solenoids, but to the same result. There is another solenoid that controls those but I want to make sure before I go draining my new fluid to get to it.

  • mike thornton Jul 01, 2013

    this is for a boat

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I had the same problem with my 96 Chevy 4.3. It idled rough enough to shake the truck at a stop. It revved up fine but sputtered on take off. My truck did not want to stay in overdrive because of the low rev. I changed cap, rotor, plugs, wires and this did nothing. Finally I took the intake off and found corrosion on the side intake gaskets near the rear of the engine causing a vacuum leak.

Posted on Nov 11, 2008

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Try the gas, before it kills the new pump! i hope you bought that pump from the dealership, or you'll be having problems with it.

Posted on Oct 10, 2008

  • IFixTVs Oct 13, 2008

    my dad owns an autoshop, and once every couple weeks someone comes in with fuel pump problems, right after they replaced it. we always get gm fuel pumps from dealer.

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