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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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