Question about 1990 GMC Sierra

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After washing truck check engine light came on.

Blew off engine.wiped off distributor put new spark plugs in. changed gas filter & air filter. The check engine light usually goes off. The engine runs a little rough when you first start it up then it smooths out when it warms up & it seems to run fine

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  • gashaus5 Apr 13, 2009

    Vaccum hose came loose from the back of carb easy fix thank you for all your help you are so helpful.

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  • GMC Master
  • 14,036 Answers

Let up hood let it idle to dry watch the check engine light . it should be okay.let it idle it will smooth out.

Posted on Apr 12, 2009

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