trbo6

Had my car, ba2T6sp flash tuned by a what i thought was a reputable dealer, any way, after a while, under certain conditions, would start pinging, after i took it back a couple of times to the original place. Anyway, got it re-flashed at this new place, and it runs harder and smoother with no pinging at all, but, had trouble finding reverse. It is a 6spM, and went to drive it out their workshop but couldn't find R. Anyway the other guy got in and found it. You have to really forcefully force it across before slotting it into R, so much more so than before. Thought it may have been from a few dyno runs and the clutch being a bit hot/warm. But the next day was still the same. Anybody had similar things go wrong? What should I do.........?