TENSIONER PULLEY!!!!!!!!!! i swear i went through all the same crap never could fix it... check it out... When the car is in gear look under the hood (with some one on the brakes) and see if your serpintine belt is jumping around near the crankshaft pulley. sounds silly but its worth a try. i replaced just about everything dealing w/ tune up etc.. and this fixed it. hey if it works give me some stars for some reason no one likes me here.
