I am running a clean 90-100hp tune and find my truck limping the tranny for a while before the truck gets warmed up. It is not throwing any engine lights or codes. just cuts out and wont let me pass 1800ish RPMs. Any clue what is causing this? I have had trouble with a p0089 code but tweaked with a table and my lift pump and got rid of that code. Tranny is still strong but nowhere near being a built up!