[trosco]

Is your back fire through throttle body one that happens when coming off idle??? or does it happen other engine speeds.
I had the poping, a mild backfire when mild throtle applied at idle, for a while. Went to the dealer about it, he was going to solve with PC III and a "dyno based performance tune" for only $850.
Guy in parking lot told me that 800-900 rpm idle in manual was misprint and 1600's should idle at 1100-1200 RPM. I moved mine up to 1150 RPM (used a inductive meter) and have never had problem again