engine check light

Discussion in '1983-2005 S-Series models' started by mud hungry, Dec 19, 2004.

  1. mud hungry

    mud hungry 1/2 ton status

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    Location:
    Haydenville, Massachusetts
    I have an 88 gmc s-15 2.8 with about 40,000 miles on it.and the check engine light keeps coming on. I check the computer and the codes that i am getting are egr valve and O2 sensor. both are fairly new any ideas. this is mainly happens going up hills. plugs wires and air filter are new. any help
     

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