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I have a buddy with a bone stock 1999 GT he he has taken off the silencing cone and thats about it. When its cold out and he starts the car the motor has a hard time when he presses on the gas. almost as if it doesn't want to go past 1500 rpm. we have checked for codes but when we have the chance to the motor is running fine. Now if he lets it warm up a bit (5-10 mins) it runs fine. One other problem he is having is that when its hot out and he really gets on the brakes it stalls but from my past experience simply cleaning the IAC fixed it. Do you think these are related? I am stumped and really dont have a lot of time to screw around with his ride when I'm trying to fix/and try to improve mine.
 
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