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ok guys i have an 87 iroc and its running rich as hell i get like 6 miles to a gallon, anyway when i hook the scan tool up it reads lean so what would be makin the comp think that its lean? o2 sensors????
 

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Yes. Have you replaced it? Are you running a single wire O2 sensor or have you switched to a heated unit? Give me the readings from your various sensors. Id like to know what they are recording.
 
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