Question about 1990 GMC Sierra

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I have a 90 GMC Sierra, 5.7 ltr, 2 wheel drive, 1/2 ton. I recently replaced the ESC module ,MAP sensor, and TPS, because they coded out... I also replaced the distibutor as well. I was running well this morning and sat at idle for a couple of minutes in park. As soon as I placed the truck in drive my motor died never to return again. I have spark, I have fuel pump - on, I replaced fuel filter now. It cranks and sputters but won't run? What else could it be? Would throttle postion sensor do this if improperly installed?

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Try spraying a couple shots of carb spray down the throttle body while a helper cranks it over. If it starts and runs for a couple of seconds check fuel pressure and the resistance of the injectors.

Posted on Nov 29, 2012

  • Matt Huffnus
    Matt Huffnus Dec 01, 2012

    Sorry , that " No " was intended for another suggested solution. In fact I did spray ether down the throttle body, and as expected the truck ran as long as ether was present. I recently had a fuel pump and sending unit installed by a shop,so I anticipate that I have a warranty issue with the pump... Thanks for the peace of mind...

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