The switch would be very difficult to remove due to its location and use of phillips head screws to mount it. The first thing to do is disconnect the pigtail on top of the manifold and check that the switch provides the correct WOT and idle signals. Mine was intermittent at idle.

The "fix" for me was to liberally spray the switch and surrounding area with mineral spirits, then a shot of WD-40 when it dried. I also disassembled the throttle linkage and gave it a thorough cleaning and lubrication. I used white lithium grease on the ball and socket joints and a shot of silicone spray lub on the roller joints.

Duke