IAC (Idle air control) valve stuck, very common. Some come apart (most Fords for ex) for cleaning, carb cleaner in the vacuum control line may help. It senses engine temp and increases the idle speed accordingly to keep it around 900rpm no matter whats' going on. If you turn the wheels, a pressure switch in the power steering high pressure line will increase rpm so it doesn't stall when parking and you do not have to add gas, turning on the a/c will trigger the IAC to increase rpm as the compressor draws power............ Just a couple of examples. Easy to find
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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