I have a 1992 F-250 7.3, i'm having hard shifts on 1-3 gear and my O/D is flashing. i've had the throttle body senor checked, tweaked, and replaced. cant seem to pin point the problem. had a lot of work done prior to problem, including new fuel pump. any idea's would be appreciated. P.S. this truck just broke 100,000 miles, and i've put a lot of money into trying to fix this problem.