I recently filled up my tank in Costco and started driving. I felt that the horse power of my car has gone down a lot. I drove it for a day and my check engine light came on.
I googled the issue and there were suggestions to tighten the fuel tank cap, which I did last night. As of this morning, the check engine light is still on and the horsepower of the car still feels lower than what it used to be? Is this something to worry about or will go off by itself?