So I had my oil changed on the weekend with synthetic oil, but they also through in Slick 50 (which I usually research stuff before I put it in the car but negleted to this time). I also put in a new K&N air filter. Today I was and the check engine light came on. It seemed that as soon as it came on the rpm's reved a little a higher to get going from a red light. However, after a couple blocks it seemed normal again. I am suppose to head out of town tomorrow and don't have a lot of time to figure this out. Does anyone have any ideas? Could it be the Slick 50 gumming something up?