Back to the misfires. has that all been handled and erased?

missfire, tps, brake switch, engine and trans temp. those are the most common causes

 

Just picked up some delco plugs and wires to help with the misfire. All temps are up and speed sensors read correct. Will clear everything after the tuneup and see what happens. #8 had 800+ misfires and #5 had +600... but no misfires in the last 12 times we drove the truck.

 

I would say thats the problem. im not 100% but pretty sure misfire even in history will cause no lu.

 

A misfire will act like tranny slipping also.