I drive a 2004 9-3 Arc Convertible, not a lot of problems lately, the baby has 133k miles on it and was serviced not to long ago. Today I hit about 90mph and right after that I've noticed this rumbling noise when I stop at stop lights, the RPM gauge goes slightly up and down 1000 rpm and when I throw it in neutral (automatic car btw) it sounds a little less noticeable. When this is all happening the engine light is flickering and the lights and SID are even showing a tad flicker as well. When I turn the car off and on there is no problem until I put it in drive or neutral. Anyone else experience this?