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Exhaust problems an my accelerator

My car has a problem,involoving the accelerator and my rpm reading,everytime the car gets hot,the car will slow down.forcing me to stop the car.What is the problem? Is it the engine,transmission?

Why does it say exhaust problems in your title but there is no mention of this in your post? What is the story with the exhaust. It is ironic mostly b/c what you describe certainly well may be a clogged exhaust system.

But you should also clarify - what do you mean a problem involving the accelerator and rpm reading? I have to assume you mean that you press the accelerator but the car won’t rev up? Then eventually it more or less loses all power?

That’s what I am reading and that sounds like a clogged exhaust.