i just put a new tps in today because i was having a tip in hesitation problem. it seems to have taken care of that problem, but while i was adjusting and checking, i heard a knock sound when giving the throttle a quick blip. it sounded like it was down low. something like what a loose converter bolt or cracked flex plate might sound like. i may have just put myself onto something by typing this. i also recently installed a pat's 10.5 inch 3200 l/u converter. i know the bolts are tight enough, but i have been launching harder, with more boost. possibly cracked the plate. it is a single knock, sounds something like if you would make a fist and knock on wood, like a door or computer desk. any ideas? i was also thinking(but hoping not) a thrust bearing. thanks for any help.