I'm having trouble figuring out my sisters car. Whats going on is when the motor is cold it wont stay running, but if you keep your foot on the pedal till it gets heat to the motor it will run. It pops through the intake also during warm up. After the motor is warm it runs fine. I'm at a loss. Tried setting the timing, swaping the Act sensor , coolant temp sensor , tps, mass air and barometric pressure sensor. Even swapped out distributors and coil. I'm at a loss any help is appreciated. The car is an 89 gt . thank you for any help. Sincerely Barry