TPS Adjustment

Hi guys, this is my first post,I hope you can help me. I have a 1994 Nissan pick up 4X4, 3.0 motor. My truck keeps going in and out of overdrive, I could have the cruse set on 65 and everything is find the trucks in overdrive about 2500 RPM then I`ll start to go down a little hill and the truck will downshift and jump up to about 3700 RPM, then once it starts to accelerate it goes back in overdrive and 2500 RPM again, till I start to go down hill then she`ll downshift again. It`s not just at 65 MPH but anytime I`m in overdrive it will go in and out. Any ideas whats wrong with my truck?
Thanks
Joe

Come on guys, somebody, anybody, HELP!!!!!. Does anybody know how to adjust the TPS????
Thanks
Joe

The problem probably isn't your TBS. It's most likely in the cruise control itself. It could possibily be a vacuum leak, if you have that sort of system, if not, a weak ground can cause the same problem.
A good auto manual can tell you how to set your TPS.

Na, it does it with the cruise off. I can be going 40 MPR and it will jump in and out of overdrive. Thanks anyway