My 97 Yukon (sorry I know it's new sheet metal)has a steering problem that I can't seem to figure out,,, #1 It's bone stock #2I've changed the pitman arm,idler arm checked the tie rod ends ,ball joints,,all are tight #3 the truck has less than 70K #4 The problem is loose steering "feel" when driving straight and as soon I turn the wheel for a correction the truck jerks as if the steering is catching up to the steering input,,,,there is no mechanical slack,only the feel of loose steering.the problem also comes and goes and is not constant. #5 I found out today that a steering sensor fails quite often on 97/98 Chevy/GMC, the sensor is located on the steering column. #6 I looked under the dash tonight and there is in fact a sensor ring on the column. #7 the strange thing is what does this sensor control? There are only 2 hoses from the P/S pump directly to the steering box. There is no wires/valves on the pump or steering box that the sensor would appear to control,so if the computer is taking input from the sensor how does it control the pressure on the fluid side of the system? any service techs got the answer to this one,,,what am I missing????