Yep. a little more info would yield a lot more help.
Some general info:
If you have a 2007 or earlier, most likely you have a primary tps with a black interior (not visible when mounted). If so, they tend to develop more or less a "flat spot" around the point where you cruise the most. On mine is was about 2200 rpm which was roughly 60-65 mph.
Replace with a primary tps with a blue interior and the problem should be solved.
also, just to head off other problems, clean the crank angle sensor.
If you decide to change the tps yourself, TuneECU can help you with the install and adjustment.