markmurfie
Well-Known Member
Yes, like the differential bushings are torn or the center support is torn on the stock two piece shaft. When universal joints are angled the two pieces connected do not rotate at the same rate, so if the back of your trans and front of your differential are not parallel the load on the engine will vary making RPM vary and the ECU can see this as shuffle. CV or constant velocity joints solve this, but are usually weaker. The auto drive shaft have a CV going into the differential so it would be the back of the trans and output of the center support that would need to be parallel. Auto's don't have the shuffle logic in their calibrations.Pinion angle?
https://en.m.wikipedia.org/wiki/File:UJoint1.png
What ever it is, the ECU is confused as it is going between torque source OSCMOD and decel/ dashpot, while accelerating.
At 7.5 psi you should be able to run .030 and not get spark blow out. Your load does indicate more like 15 PSI, that you should be at .028 or less, but as you said it's a bad incomplete tune.
Sai Li, Lund, PBD, AED any off them are fine, try reaching out, open tickets, and start a conversation, see who you like the best, who responds the fastest, and go with that one. Promise you it will be a tough choice. Any of them should have you sorted out in no time.
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