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so my lawn power shuts off randomly. if i shut the PTO off before the lawn mower fully shuts off it starts right back up and i engage PTO and keep mowing... for about ten seconds then it happens all over again. if im too slow at shutting off PTO it backfires loudly. but all in all it doesn't fully shut down. this is really aggravating because it happens every 10-20 seconds any help appreciated