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JB4 upgrade transmission slip?
I recently did the JB4 tune on my 440i Xdrive and sometimes on map 2 and always on map 3 it feels like my transmission slips? Misses shifts? and has a huge lag? It's Automatic and just has a afe intake mod. I'm running 94-96 octane. Anything I can do to help this? Any suggestions would be greatly appreciated!
Cheers!
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