I have a 91 Silverado K1500 4x4, 5.7L 350, TBI, Auto, 220Kmiles... Its been a great truck, for the most part it runs and drives great! but at low idle or low rpm's it missis,sputters,surges and if im just barely giving it any gas it almost wants to stall out. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. Its had new plugs and wires installed not too long ago, ive changed the fuel filter, took the Idle Air Control sensor out and cleaned it (still might need a new one tho), but ive had people say the throttle body position sensor and also found out maybe the thermostat sensor? This is my first GM but didnt know if anyone had anymore info or could help me out with this a little. Thanks!