I have recently installed another 2000 model 4r70w from a mustang from a wreck due to radiator ruining my tranny. (Did the swap, re-pin 15 years ago along with the Jmod.) I wasn't able to drive it for 5 years and recently filled her up and started driving. It shortly after started what I thought was a misfire at light throttle/load until i scanned it and found a loose plug wire and all misfires went away. Well it still acts like a misfire but occasionally it is like a rapid fire machine gun and I have to let off the juice to stop it. I tried holding light pressure on brake pedal when it is acting this way to see if it would stop and it doesn't. I really don't want to drop it to replace the torque converter. Is there a possibility that it is the lock-up solenoid? Solenoid pack? Is the cheap $40 set from RockAuto worth a try? Mercon V is expensive but it is less than a shop who gets $400 just for the remove and re-install.