JDM as Fock

Hey, i own a 1992 silvia s13 Sr20de and lately when it is heated the idle goes up and down. So i thought it was the butterfly and idle air control with carbon build up, so i cleaned it. but now when i turn off the engine when heated and then turn the car back on it goes upo to 2 thousand revs then drop to 3k or stalls. please helpp

Hi i am lookin for a r32 or r33 or even silvia s13. I am a P-Plator so i need it to be non-turbo. My budget is up to $7000 Email me if you have info: hazaguy@gmail,com Thnks