to 20 throtle

There's a fiber washer under the dash. It's about 2" diameter, has a spring that holds tension against it. If the washer is broke, or stripped, or the spring is backed off, it won't stay where you want. Also at the front of the long rod that runs along top of the engine, there is a horizontal spring, called a compensator spring. If it's gone or unhooked, the throttle will move on it's on.
 

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