Have a 2010 Gator 620i with fuel injection. At 150 hrs it started stuttering and running rough and had gas in the oil. Per instructions from dealer I took throttle body apart and sprayed with JD Carbon and Choke Cleaner and started putting Sea Foam in the gas. Also installed new plugs - BPR2ES. Gator then ran fine but was still getting some gas in oil. At approx. 300 hrs the dealer replaced Fuel Pump and Fuel Filter as it was making a squealing sound. After that was running good but had to change oil every 30 hours because oil up above full mark 1 inch due to gas in oil. At 355 hrs it started running rough again. I've tried to clean the throttle body assy as before, put in new plugs but still not running good. Not same roughness as before. Now it coughs and sputters when start it, but hasn't died yet. When push on gas peddle it also coughs and sputters. When moving at a steady speed and holding the gas peddle steady the Gator engine speeds up and then gradually slows down to almost an idle then speeds up again, even though haven't moved gas peddle. It keeps doing this at about 5-8 second intervals. Sounds like not getting gas. I thought maybe the fuel filter was partially blocked and was going to change it out. However I took off the gas hose going to the throttle body assy and it's pumping out a good stream of gas when you turn the key on. Apparently some sensor is not working right. Any help would be appreciated. I'm not happy with this John Deere Gator and obviously I'm not the only one having problems. Thanks for any suggestions.

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