I have 95 contour,4 cylinder. When I turn a/c on I get a noise. I have been told this could be serpentine belt..Does this sound reasonable and replacement of the belt $110 is about right? When I press brake and car is in drive and almost stationary I get what appears to be vibration of the engine as it appears to be struggling (fine once I drive a bit faster). I was thinking replacing spark plugs..Anyone know the spark plug gap & what size socket I would need?
Thanks.
