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Here is the deal. The throttle sticks open on my engine DD 8V92 Silver 475 hp). Started out intermittently but now it does it consistently. I first thought it was the cable from the air cylinder to the throttle lever. In fact it was sticky so I replaced it. Next my beautiful assistant operated the throttle pedal while i observed the engine with it not running. The lever operated full on to full off every time. Then I started the engine. When the throttle pedal was depressed the engine went to full rpm and would not return to idle when the pedal was released. I went back to the engine and the cable had released the throttle lever but the lever had not returned to idle. I easily returned it to idle manually. Is perhaps there a spring missing that pulls the throttle back? I am perplexed. I hope it is not a failing governor or the like. I am considering installing a spring return for the throttle. Cant drive it this way. Too much of a thrill!