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Over the summer I topswapped my 04 grand prix and now recently it has been surging at idle after maybe 15-20 minutes of running. Mods are headers, 3.6" pulley, HAI, colder plugs with new zzp wires, and zzp canned tune. Car has 0 kr and seems to be running fine besides that. Recently on start...

So after putting in my topswap I am seeing -7in/hgs of vacuum on my boost gauge and -9.5 on my aeroforce. How should I check for vacuum leaks?

Anyone know any junkyards with a 04+ grand prix in it? I need a MAP sensor bracket and a alternator bracket out of a gtp so I can finish my topswap. I think the alternator bracket may be universal throughout the SC 3800 engines so I dont need one out of a grand prix only correct? I can take...

So I just got done installing my top swap on my 04 grand prix and the car will not run with the MAP sensor installed. I can get it to start one time with it plugged in and it runs alright but if I shut it off it will not start up again and if I run the car for about 5 minutes it will shut off...

Does anyone have a extra set of L32 valve covers? I need to get a set really quick. Thanks!

Anyone got them and are willing to part with? If so give me a price! Thanks

I have a 04 grand prix and have been through like 3-4 different relays cause they keep getting corroded and stop working. Anyways, I just got my new one and this time used dielectric grease and silicone to seal the relay to make sure it doesnt corrode out again and now only my drivers side fog...

This may of already been asked but I did a quick search and have called around some but have found nothing. Does anyone know a place the will tune a 04 pontiac grand prix with the 3.8L V6 in it? I just completed my top swap so I am looking to get it tuned. Thanks for the help in advance!