...yesterday? i put gas in my 2005 ford focus yesterday, and drove down the road. when i went to park at the grocery store, my car stalled. it restarted just fine and no other problems. then today, then tonight as i was driving home from work, the check engine light came on and stayed on. the gas cap is on and tightened, so it is not that. do you think it is bad gas? or something worse?