My Cavalier did that during cold nights after sitting for a while. Vacuum lines were rotten behind the throttle body. Replaced those and it started starting. I had to hold the gas and make sure it doesn't stall until I drove it for 5 minutes and then it was fine. Could really be anything at this point though.
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2004 Pontiac Grand Prix GTP CompG -- Supercharged 3800 V6
??,??? km
??,??? miles
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