If the wiring is good a motor mount shouldn't hurt. I just ran mine wrong, that's all. As far as the backfire and stumble, sounds like you're still getting too much fuel in the low settings. I would suggest changing from -1 to -3 on the low settings so that you know no matter what throttle percentage you're at it's always gonna pull 3%. If that doesn't work, try raising the lo throttle up to 35%. I wouldnt go any higher than 38 but this might help out. Are you in boost when it does this or just anytime?
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