Finally I have all the fuel leaks and Brakes fixed on my 1993 F250 7.3 IDI Turbo with a 5 speed. Took it out for the first test drive since I bought it and now I have a question about the RPM's. It will only go up to 3000 rpm's unless I'm going down hill wide open and it will creep up to 3100-3200 rpm's. Seems like I should have at least 3500 rpm's. If that is true, how can I adjust it up?