I have a 2003 Tahoe with built 6.0 and turbo kit im having a problem where the car pulls until it reaches 6300 rpm it feels like its misfiring with no pops or bang or its hitting a rev limiter but in the tune its been raised till 6700rpm and the problem still occurs so the car wont reach the shift point which has been set 6500rpm it will stay in the 6300rpm range and do the misfiring shit.
please if someone can chime in and help.tune00.hptproblem.hpl