When the car is in N, If i go pedal to metal it will cutoff at 4k rpms every time like when you hit rev-limiter, but if i go slowly it'll go all the way to red line or if i punch it multiple times it'll go past 4k to redline. any ideas? It has been tuned on a p28 crome, but i havent noticed this problem in the past. any ideas or suggestions?

 

sounds like launch control.