Go back to basics and ask your self if this vehicle didn't have all the electronics what could be the problem. WE are back to fuel, spark and compression in time.
The idle in older vehciles was contolled by changing the idle air controls on a carb. Now we deal with Idle Air Controllers. It is the module that opens and closes allowing more vacuum into the intake controlling the idle.
A few whiles ago I had an idling problem with a Toyota truck. It turned out there was a piece of lint stuck in the mass air flow sensor.
Let me know the engine, tranny, vehicle type, mileage and engine and I will try and help. Good luck
Monday, April 24th, 2006 AT 7:28 PM