Check engine light comes on regularly but then goes off after significant time. Supposedly the gas cap. I replaced it and the light went off for some time but then a few weeks later it started again. The light seems to come on as I slow from highway speed to enter a town or exit on a ramp. Have not been able to determine a fix though I have tried everything I have seen on the internet short of just starting to replace emissions control components. Certainly lowers the value of the car. Lots of people seem to be blogging about the same problem.