Agree with Steve, you are dumping fuel. I would start with the idle adjustment screws at 1-1.5 turns from full seat. check what jets you are running from stock calibration and ensure the power valve is working. 6.5" is the norm, Holley says it should be half your vacuum reading for starters.
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1979 Firebird Trans Am 301/4spd (Now 428)
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L
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