OK I did the diagnosis of my car and cylinder 4 is misfiring. THats why i guess it was running like ***. It happened last night I believe after I got gas but it might have happened right before. It was fine until the trip to the gas station never the less. What could be causing this faulty plug? Faulty injector (oh please no)? Any suggestions? Im sure someone else has had this before.

 

could be either a faulty ignitor (about a $70 part) or maybe your plugs are loose or worn out