So straight to the point. My car is a bone stock automatic. When I put it in gear (reverse or forward, just as long as it isn't in park) and continue to idle, my car begins to idle roughly. When I turn on the A/C a similar thing happens, but rougher. Also (although possibly unrelated), when I sit for a while (like at a Drive-Thru) or if I am going from 70 mph down to 35 (getting off at an exit from a major interstate, for instance), my SES light comes on. When I'm idling, I can predict when the light will come on because the rough idling I mentioned earlier eases up a little bit, and the engine's idle sound becomes slightly higher pitched and slightly smoother. Anyone have any guesses as to what kind of problems my car is having? Thanks.
-Ben