97' Mercury Check Engine Light . help please
Hi I have a mercury 1997 and it has about 62,500 miles on it. I bought it about 2 months ago and whenever I put gas into my car the next day or after a while the check engine light will go on. I will then drive it and it will go off in about two to three days. Now when I go get gas again it will do it again and again ect. My machanic checked it and didnt see a problem. He didnt make to much of a fuss about it either. can anyone help? all suggestions are very much appreciated thanks.