I have a 01 raptor that was stock and ran awsome , but I wanted more!! I purchased a used Pro-Circuit full T-4 system (2" end cap), UNI air filter , and a Dynajet stage 2 kit (with fuel needles) and a new (stock) spark plug. I installed every thing making sure to follow the instructions on jet kit to the letter!! Now it idles rough and it wants to stall on hard braking but the performance is awsome in between. spark plug is light black in color, the inside of the head pipes are white and they glow dark red at night. I have adjusted the mixture screws till Im blue in the face and my hands are burned from the exhaust pipe with no luck. Any help would be great.