Tps

I was checking the throttle position sensor on my 91 turbo last night. According to the specs. the resistance between the two terminals I was checking was supposed to be between 3.3 and 10.3 with the throttle fully opened. But when I fully open the throttle, the meter reads OL. Also with the throttle closed the resistance is a bit higher than spec. Does anyone know if the tps needs adjusted or is it no good. The car is also missing a good amount of power.