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Pontiac Grand Prix Questions

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Its the belt on the alternator that slipped off ilas i was replacing it i noticed,my power steering pulley was loose and i,could pull it out what could this be?? Was told get bew ps pump and pulley i should be good advice???
I turned on my ignition and the speedo pegs out and drops back to 0. I never tried to start it. Crazy!
need a price for replacement
how do I check to see if the motor for my power window is bad
one second its full and then it's back to empty again and then back to full and then back to empty I don't know how much gas I got in itm
note before that I was getting a OBD2 ccode large leak detected. changed gas cap. cchanged purge silonoid. and there was a gas odor evertime I put gas. come to find out my catylac converter was so pluged it turned into dust when I knocked it out. so then thts when my Odometer sttoped working and mmy tranny started to not shift.
the rpm level dips a little then kicks back up what would cause that
My 2000 pontiac grand prix is cutting off on me sometimes it starts for a little while and other times just to fire it up you have to pump the gas pedal and keep your foot on it to get it to start and stay running and sometimes it just won't start at all. I have replaced the fuel pump fuel filter spark plugs.
When in cooling the system blows air normally. When in heat it is unable to blow a significant amount of air through. You. Can hear the blower revving up trying to push the air through, it appears there is a door not opening to allow it to be adequately forced through the heater core. At one time someone was able to move something from the passenger side and it blew normal, but for the life of me I don't know what that was.
Begining late june this starting happening, my car would jus shit off while driving since then i have replaced spark plugs, wires, ignition control module, all three coils as well as cps and a new harmonic balancer balancer simply because old one was broke still keeps happening im at a loss and it throws no codes please help
I have replaced gas cap and put new hoses on charcoal canister but did not help. It comes on more when you get below a half a tank of gas
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