I have been fighting my 01 GTP for several months now. I have replaced the Rack Power Steering pump exhaust MAF air filter. the car runs fine until it comes tie to down shift/ idle. When down shifting the car it is fine until it seems to hit 1st while hitting the breaks. it dies then jumps back up and makes a horrible detonation time sound every time it does it along with making it very difficult to steer. accelaration is no problem. PLEASE HELP
Thanks