I have a 408" LS with a GMPP 4L85E Supermatic transmission (E38 engine controller and T42 trans controller) that seems to want to push through the brakes at idle when the truck is warm. The transmission is stock (other than vasco input shaft, deep alum pan, large ext cooler) and I have a lockup torque converter. When cold, the trans shifts ok. After the truck warms up, it becomes difficult to keep it stopped a light. The engine doesn't seem to idle down properly and the trans seems "locked". It wants to push through the brakes. I have to shift it into neutral to keep t from rolling through the intersection. Once shifted into neutral, the engine seems to idle down properly. As soon as I put into drive, it wants to push through the brakes again.
Not sure f it is mechanical or something in the engine/transmission tune. I don't have a log file just yet. Hoping for some general advice or maybe that someone will spot an obvious flaw in the tune -see attached.
408 LS, HiRam, 102 Nick Williams DBW TB, 235/239 and .610/.610 cam, 88mm turbo @ 14 pounds, 4L85E, Pro Torque 4500 lockup torque converter, 9 inch, 4.11 gears with 32 inch tall tires.