Here's a pretty good example of the idle stop solenoid that allows the throttle plates to drop completely closed as the ignition is turned off. Engines have a tendency to run-on, Diesel, or backfire on shutdown without it.

www.ebay.com/itm/184573184071?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!