1990 Chevy truck runs rough after engine warms up

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    • September 4, 2016 at 6:54 am #13939
      Mike Grosvenor
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      I have a 1990 Chevy sierra 2500 4×4 truck that always ran very good until one day driving home it started to run pretty rough. Since then it runs good when I first start it up but once the engine warms up it runs pretty rough and gets horrible fuel mileage.

    • September 8, 2016 at 11:48 pm #14047
      Jimmy t
      Guest

      Bad fuel economy seems to be the key here. If the engine is running that rich, it will cause it to run poorly. You may have a bad fuel pressure regulator. When they go bad, they leak large amounts of gas into the engine causing it to run bad and have terrible fuel mileage.

      Or you could possibly have a stuck open fuel injector.

      • September 14, 2016 at 1:03 pm #14054
        Mike Grosvenor
        Guest

        Thanks,I will try those suggestions.

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