Check that your idle engine speed is about 700-800 RPM. If the engine idles at 500 RPM (or less) then it will probably stall when you put it into gear (D or R). Also there is a 'stepper motor' ( called a 'idle air control valve' sometimes) attached to the throttle box that might need cleaning or replacing. If your are not used to playing with engines like this one, get some help from a good mechanic.
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