[ZTZ1010]

Had the car in last week for a misfire on cyl 3. they replaced all 6 spark plugs and put a new injector put in cyl 3. driving today and low and behold, misfire cyl 3. swapped coilpacks to see if the misfire would follow, still cyl 3.

any clue what else it could be? I'd be shocked if it was carbon buildup, as I only have 35k on my 335 and have been running meth for almost 15k of that.. the only code being thrown is 29CF. no HPFP/LPFP related codes so I'm not sure where to go from here... I'll bring the car in next week but any advice would be helpful in the meantime!

thanks