OK, here's the deal. Gotta TT cam chip and exhaust, put it on, then I got some ping. pulled the chip, sent it back, no ping with stock chip. Got the new chip (only 3 degrees advance as the previous was 6)............ PING. I always run the good stuff (93 octane) and clean my fuel system regularly. Changing the fuel filter, O2 sensor and injector O-rings. Also gonna try some colder plugs if I can figure it out. I have bosch platinum +4's now, but dont know the heat range, any plug suggesions? I know some of you chipped ppl have had this problem so help a brotha out. What worked for you?