1997 GMC Jimmy Possible Throttle Sensor positioning problem

I doubt its the tps. Usually a tps is going to give you a code every time and they do not fail often in this truck, you are much more likely going to find a sticking injector or bad fuel pressure regulator.

Well if your not getting any check engine lights, I don't think that your problem is your throttle position sensor, although it could be a little weak, there is not much you can do to determine that until it gets "week enough" and the light comes on. Or you just replace it. What I suggest you do, is do a nice throttle bore and throttle plate cleaning and a nice decarb. With seafoam. You have to find someone that knows how to do a decarb though because its hard to explain and if you do it wrong you could hydrostatic lock your engine. What it does is removes all of the carbon build up on your pistons and valves. The whole top of the inner engine. Its an awesome thing to witness because the carbon that emits from your tail pipe is unbelieveable. So just try that first, if you have the extra money to replace the throttle position sensor then go ahead. But other than that just go with the cleaning and try to find someone that knows how to do a decarb