Fitted a 52mm throttle body I am finding the TB is sticking open very slightly which means when I come off the gas the revs stay at a constant level (V v unnerving!). I have looked at the spring mechanism and the spring for the valve is on top of a white nylon runner/washer. I have greased/oiled this but it still sticks open and will not fully shut. If accelerator whacked open it whacks fully shut just not at slow on/offs on the pedal? I have checked the cable and it is ok just the TB??