Gassed up one day and the check engine light came on. I re-installed the gas cap and took the negative lead off of the batterey. Problem solved, for a couple of weeks. Wife put gas in the car and the light came on again, and same problem. Thought it was the gas cap. Now when you put a load on the engine ie...heavy accelerator, the light comes on and engine flutters. When you shut the car off and start it again, something resets and the engine runs fine, until you give it a lot of gas. Then the engine starts to flutter. So everytime you shut the car off, something resets and will run fine until you accelerate.