My car sounded like it was pinging at 4k rpm and above so I was wondering if the timing was off. I hooking up my neighbor's old timing light, it seemed to not be working. In the meantime the only thing I had done to the car was adjust the idle adjustment screw. Took the car for a quick spin anyway figuring wth.....and now the noises are gone. They were pretty audible before so it seems to be fixed.