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Over Rev between shifts

Im sure this has been covered but let me state a couple of the issues that I am specifically having, and hopefully it will help someone in the future. So I have a 2x4 power adder on a 6-71 with a five speed behind it, the problem is 2 fold, between shifts the RPMs either doesn't drop or even climbs, and on decel, if I let the truck slow down with the throttle closed then push the clutch in above idle RPMs it will die.

DEFCO disabled by maxing out temp.

no logs yet.

354 hemi 6-71 blower.