I have a 1997 Chevy Silverado 2500 2wd with a 350 automatic. It has about 185,000 miles on it, Ive had no problems out of it until now. Yesterday I noticed it is using more gas than normal, It doesnt feel like it has as much power, I floored it and it just didnt accelerate as normal until I let of the gas pedal a little, then it took off and shifted as normal, the transmission was also acting up. could this be a throttle position sensor? any other suggestions? any help would be appreciated.