I'm sure averybody already knows this but I had that problem when I first purchasd my 98 Contour SVT. A buddy of mine at the dealership told me I probably had cheap gas(not above 91 octane) and to tighten my gas cap atleast 3 twists. Apparently there is a censor right on the cap that will cause the Check Engine Light to come on. I haven't had a problem since!
