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Yes, the cruise units (actuator and controller) could fail and the vacuum of the running engine will pull throttle to WOT 🤔
Remove cable or vacuum tube (cap it) to investigate.
 

· Super Moderator
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Does it return to idle by itself, or you do something? (break/clutch/master switch)
It's probably the control module that is faulty.
Right side kick panel.
 
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