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Hi, I have a 2005 polaris fusion 900 and it sounds like it's running on one cylinder if you gun it right away, and then you have to slow down and slowly get on it, then it runs flawlessly and all the power in the world as long as you keep the rpms up. I just changed the fuel filter, good fuel, changed the tps with a used one that was already on a throttle body and new spark plugs in it. Any help is appreciated, thanks!