2005 Pontiac Grand Prix GTP Questions

All 2005 Pontiac Grand Prix GTP Questions

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i noticed when i was flushing my brake lines(i was doing that because i was changing my brakes and calipers and troubleshooting why i had no brakes) that a sensor was unplugged from my master cylinder. i plugged it b...
My air filter was changed out to accomodate a K&N round filter, before i bought it, and twice i have almost catastrophic random cylinder firing error messages on the the message center. each time i have to pull over ...
Came on after I changed the water pump
Automatic transmission will not work in Drive. Must use manuel tap shifters.
traction/stability check lights pops on; is this a sencor problem or transmission problem ? can i fix it myself?