Wierd problem after siting for a few months.

Definitely some kind of limp mode. Sitting for a few months... did you get rid of the bad gas from the tank and put fresh gas in?
 
My weed whacker does the same thing, it's normal *jk

My first try would be to disconnect the battery for 10mins, reconnect, try again.
Sensor issue? Any signs of critter damage from sitting over the winter?
 
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