My friends 91GT has been popping out of time. Apparently it drives fine when the car is cold. But after a while of driving it, it starts to idle out of whack and turns off. Hes taken it to a couple mechanics who changed the distributor and fixed it shortly. But after he gets a little throttle happy. The car will start doing the same thing.. Can anyone please help! I tell him theres nothing better than fixing the problem on your own but we need a good starting point on what it may be.. Any help will be appreciated, thanks!