Certainly does sound like the governor system. Had that problem a little over a year ago after a 1000 hour service. Not sure it was related but the tech found a loose wire connection to the governor. He didn't like part of the set up so he did a minor "upgrade" and got it working. Due to the fact the shop had done the 1000 hour service in the previous month they did that work for free.
The tricky part, according to the tech, was that the wire problem wasn't very obvious and can be easily overlooked. Take that for what it is worth.
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Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V 2020 Jeep Overland, Blue Ox Avail, SMI AF1.
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