What speed do you notice this at? Or does it happen any time you begin to coast? I have the canned tunes but my torque converter is set to lock up at 40. If I coast down from 42 the converter unlocks at 40 and I notice that sometimes. I do know when it locks I notice a drop of about 3-500 rpm, maybe the unlocking causes the gain in rpm. This is a complete shot in the dark and I am probably way off. I do hope it's something simple though. Problems are never good, especially going into a weekend.
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