Judging from the symptoms, I doubt this will work, but you've got nothing to lose--try a throttle reset:
--key off
--key on
--throttle wide open
--throttle full close
--throttle wide open
--throttle full close
--key off
--key on
--start engine with no throttle
--allow engine to find idle without touching throttle
--once it settles into an idle, key off
--you're done*
*but if this simple fix solves the problem, you owe me a  or two of my choosing!!
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