Hey guys. I got this 2015 Ghibli Used at 29100 miles a couple hundred later I got a Stage 2 tune and Fab Speed Catless Downpipes pipes. The first day it stalled and went into Limp mode I haven't seen it before so I took it back to the tuner and they plugged it in and nothing. The next few days it was fine but three days ago when I floor it the gear hangs? Up and doesn’t shift it just revs at RPM backfiring. I have a video of I’m not sure if I can upload it.