car jerks when I stop at the stop light. If I turn off the a/c it seems to go away. it doesnt jerk while i accelerate just while at a complete stop. seems like a miss fire. but i really dont know! the other day i drove through mad rain and it seems like water got in the the engine and splashed up onto the hood. once i got into Oralndo and hit a red light it started to jerk. funny cuz it never did that b4. please anyone can help thanks