:could explain loss in peak power. Next, check your TPS and MAS connections...their could be corrosion on the connection itself. Injectors clean? You may also want to check the FAQ section on loss of power. Correct me if I'm wrong but a stock TT (healthy one) should be doing the 1/4 at low to mid 13's.
Mas and TPS were clean, I didnt do fuel filter yet. What should stock plugs be gapped to?