i have a 350 tpi and when the motor gets hot it runs bad, ive had every test done on it and all the sensors are ok and the fuel system is good and so is the ignition system. so i think i have an intake manifold gasket leak. ive come to this conclusion because when metal heats up it expands so when the car starts up for the first time it runs perfect because the engine is cold and the gasket is sealed. but when the motor get warm the metals expand creating a gap in the intake manifold gasket. if this is true how would the car run with a bad intake manifold gasket? would the car run choppy and sometime stall, also have no power when accelerating?

 

u are not supposed to post the same entry in more than one location. im sure a moderator will be telling u this soon. anyways it could be a ignition module or coil that is trying to go out but isnt ready to so is messing up at higher temps.

 

Since you think it is the intake gasket check the whole area for vaccuum leaks.
that could be the cause of your problems.

 

Could be a couple of things. As the engine is heating up and you're driving it, does it feel like the problem starts out minor then gets progressively worse? If it does, I would also suspect an intake manifold gasket. And it could be leaking internally where you can't see it.
You know your ignition is good? But it's still possible your coil, or ignition module might be overheating and causing the ignition to crap out. But that would come a little more suddenly, as opposed to the engine gradually running crappier as it heats up.