When I punch the gas pedal from a dead stop or rolling at a steady speed, the car obviously launches and the rpms go up but it hits 3500 to 3k bounces back 3500 to 3k continuously and I have no clue wth is going on. I warrantied my cat but put a ZZP cat-less DP in and tried it again. same crap. flys right up to 3500 drops to 3k real fast then 3500 then 3k. any help will be appreciated