Question about 1990 GMC Sierra

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1990 GMC engine light comes on when on the highway but turns of at lower speeds

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HAVE IT SCANNED AT AUTO ZONE FREE.THEY WILL TELL YOU YOUR PCM CODE TO SEE WHAT SENSOR CAUSING CHECK ENGINE LIGHT TO COME ON.

Posted on Sep 24, 2009

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I have a 95 gmc 350 half ton and my check engine light comes on when I am on the highway and goes off when I drive at lower speeds. I am also getting poor gas mileage.


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