Well My 02 gt has been idlnig at 500 and when i aply the brakes the rpms drop to 400. When i first start it ir runs at 750-700 and it runs great, but then it warms up and then runs really bad when it runs at 500. What do you guys think is wrong? please help i need to get it fixed i am running really slow!!! i habve a 75,000 warranty so what ever it is its covered, thanks 
