So, I recently ran codes on my truck, and the TPS was below or above voltage, I believe it was below, but I forgot to write it down at O'Reileys. I bought a new sensor and was hoping someone could give me a brief but informative guide to replacing it. I know it's on the bottom of the Throttle Body where the two hoses from the air intake meet, and it's next to the air inlet sensor. I likely have to take of that piece, the one the air hoses attach to, to get to the sensor on the bottom, and I should get a new gasket to put on it when I reassemble. What is that gasket called? Anyone have any good information for this? Thanks.

Also, I'm curious as to what a bad TPS would affect in the performance on the truck, currently, when on the highway cruising anywhere above 45-50 mph, where it's in overdrive, if you let off it goes into extreme engine braking and slows down quickly, also if the throttle is barely applied it goes back and forth between closed throttle and barely open. Any ideas?

Thanks Guys