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The previous owner has screwed things up by changing the air intake and eliminating the air temp sensor. The car's computer depends on a series of sensors to determine what fuel mixture it should command, and now it can't do that properly.
When the car is cold, it knows from the coolant temp, and it sends plenty of fuel, but when hot it is getting the mixture wrong.
Restore the air intake to original, with the correct sensors, as it should run OK.
If not, then go looking for a vacuum leak or an air leak in the air intake hose and plenum somewhere.
If the engine seems to run OK at all rev ranges without stalling, then I would look more closely at the transmission or even the brakes. Make sure there is nothing in the air intake system, such as an animal nest. I would expect that brakes, especially the parking brake, could be rusted badly.
It sounds like you may have a vacuum leak. Your car should normally idle at about 700-750 RPM. You said that yours was at about 1000-1500, that is waaay to high. If you have a leak somewhere in the system the car will draw in extra air and it will want to idle much higher and will also be very erratic and hard to drive.
check for a vacuum leak,you could possibly hear a whistle under the hood,or you can spray starter fluid near the intake manifold where the suspect leak could be and if the engine accelerates it has an vacuum leak,try the simple things first,can also be a clogged PCV valve,it is in the valve cover somewhere and it will have a rather large rubber hose going to the intake manifold