2003 Ford Windstar Q&A
2003 Ford Windstar Question: my rpm go up and down
Fluctuating idle speed can be caused by an air intake problem or a sticking idle air control valve. Have the vehicle diagnosed to be sure. - DaveJHM
My car was having problems when I drove at 50mph; it looked as if the spark plug was failing. So I changed the spark plug, the fuel filter, ignition coil, and cables and after that the rpm keeps go...