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if it has fuel injection i would check the o2 sensors.i had a gm that was running way to rich so i did a diagnostic check and found out the o2 sensors were bad sending wrong info to the computer and messing up the mixture.it ran fine under power but only at idle you could tell.my car was a 91.

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Q: Why is your 1992 Chevrolet 305 pick up truck running too rich while idling?
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