I do have one other question; It seems when I have the A/C on (sometimes it does this with it off as well), and I am sitting at a red light I will feel the RPM spike about 100 and the car will jerk. I assume this is some kind of misfire, but I don't understand why it only happens at a light. When I turn the car on, sometimes I will hear a little "pop" come from the exhaust if this is a clue to anything specific.
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