i just recently had evo 8 tuned made 318 whp, now when i get on it and hit around 5000 rpms the car feel like to me it wants to misfire not sure if thats what it is can some one help in findin why my wants to spit and spudder at those rpms. the only other thing i can think would be the injectors, but it didnt do this til bout a week after the tune