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Old 04-19-2011, 11:37 AM   #2
GTP Dad
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Join Date: May 2004
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Re: 1998 grand prix GTP 3.8L V6 supercharged, random misfire

Welcome to AF!!

There are several possible issues here. First, how long since the plug wires were changed? Second, because the fuel pump kicks into high when the supercharger kicks in and increases fuel pressure there may be a problem with the injector on that cylinder. I would also do a compression check on that particular cylinder to see if you have a valve issue. I hope this helps with pinpointing the problem. If not post again and we can try something else.
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