The chattering sound is the stepper motor trying to cycle. Check to make sure there is no interference, move the throttle linkage by hand back and forth fully as sometimes the 17, 18, and 20 butterfly valve sticks on the carburetor gasket. If this happens, remove the gasket and use a file to put a good bevel (45 degree angle) in it to stop it from hitting. Thats all it takes.
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