V6 idles rough at first & backfires until warm

1985 PONTIAC FIERO
90,000 MILES
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PACKERFAN1
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When first started it idles a little rough but not bad.Stays running. It will backfire 3 or 4 times when getting on it for the first couple miles. After that idles & runs fine. Lacks a little power when getting on it at the end of each shift.Replaced plugs, wires, cap,PCV & rotor @ 89,000. Problem just started a month ago. Any ideas?
Aug 5, 2012 at 7:14 PM
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ASEMASTER6371
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could be running lean, the coolant sensor could be bad, could be injectors. a shop with a scan tool can monitor the sensors to see which one is out of parameters.

Roy
Aug 5, 2012 at 7:33 PM