It codes as a cylinder 3 mis-fire. I had all of the spark plugs changed and the check engine light is still on. It took 3 inspections before it finally passed. When the gas tank is full It feels like it runs better and I don't feel it misfiring. Has anyone had any experience with this?
My check engine light has been on going on two years now. on 2007 Chevrolet Cobalt
Possible weak fuel pump, have seen that before.
try a higher octane gas next time you fill up.