Ever since I installed the 93 octane tune from LMS I have periodically had an issue where the car does not shift into second gear right away on WOT.
I will have the car in D and hit the gas. Once it gets to where it should shift, the car just cuts power like it is bouncing off the rev limiter. Power seems to come back, cuts again, then shifts into second gear.
This used to only happen once in a while but now seems to happen almost every time when starting from a dead stop.
Any suggestions?