This is an out of the Box one; what would happen if the Bowden Cable was sticking (if that is possible).

I once had the Throttle on my Motorcycle stick due to moisture freezing inside of the Cable. The return Spring did was not enough to shut it off and Engine ran away; until the Bike and I hit the ground.
Fortunately I was only in low Gear.

__________________
84 300D, 82 Volvo 244Gl Diesel