[Jim Sims]

Bob, There is a microswitch on a 73.5T w/CIS (item 14 in the 73 wiring digrams here on Pelican) but it is switched to a contacts closed position when you pull the hand throttle lever all the way up. It's only function is to send power to the cold start valve while the starter is cranking and only while the starter is cranking. The switch is located on the throttle linkage on the driver's side of the throttle body. The hand throttle of course affects idle as it mechanically opens up the throttle valve. Under what circumstances does your idle speed drop to zero and return? Jim