Is your hot idle stable 800 rpm and if you load the engine.. say blower full, high beams, window heater etc and it recovers to 800rpm.
If not I would diagnose the ISC. Mine is dead and previous owner has done some dirty tricks to get hot idle around 800rpm with high beams etc its 650 and not correcting at all.
If you are sure yours is ok, then I would check for vacuum leaks. Reading the forum they seem quite common on older cars.
Sadly I have no better idea and mine is with manual box so no idea what other electronics there might be.
Wait for fixkick to reply, but I though to suggest these as he has been bit more away / responding slowly. Or scroll the forum / docs for diagnosing something with similar issues.
If not I would diagnose the ISC. Mine is dead and previous owner has done some dirty tricks to get hot idle around 800rpm with high beams etc its 650 and not correcting at all.
If you are sure yours is ok, then I would check for vacuum leaks. Reading the forum they seem quite common on older cars.
Sadly I have no better idea and mine is with manual box so no idea what other electronics there might be.
Wait for fixkick to reply, but I though to suggest these as he has been bit more away / responding slowly. Or scroll the forum / docs for diagnosing something with similar issues.