rev not past 4k
 

i can sit in the car and rev it to red line in nuetual but once we get going and the rpms get to 4k it does not go anymore. what the heck is the problem? all the hoses are hooked up for the turbo so could the waste gate not be working? thanks guys.

this happened to me not to long ago, and i found that there was an electrical cord missing off the throttle body. It was the front edge of the throttle body, looking from front of car it's right in front of you. Not sure where it was coming from.. well from the right but dont know to what. hope that helps. I can get a pic for you if you need, just let me know.