Unfortunately, I'm not sure this problem is related to the popping I described earlier. My car seemed to take a crap on me all at once with these problems. Reason I'm asking about calipers is that I'm hearing squealing from my wheels and I didn't put on new brakes but 6 months ago. I pulled off all of those squeal tabs b/c they are annoying me, but the wheels still make the squealing noise...not quite as bad, but still makes it. I pulled them off one at a time, driving in-between, to try and ID which wheel is hanging up...but I got off the last one, and like a pig being branded....still squealing!!
I also just replaced my plug wires b/c my car was hesitating horribly under slight to moderate acceleration. It seemed to take care of about 85% of the spuddering issues..but a bit is still there. I'm thinking maybe plugs(just replaced <6 mos ago) or coils. Possibly fuel related too...maybe I'll put some techron in there and see what happens.