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Missing a Cylinder - Advice Needed

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Engine Upgrades

Can You Tow Too Early?

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It feels like my 03 SO is missing a cylinder under load. When pulling a two snowmobile trailer up a hill, or going to pass, or even getting on the freeway empty at moderate throttle it starts chugging.



In fact it feels exactly like a gasser with a bad spark plug wire.



I've changed the fuel filter since I first noticed it. It does it with the Bully Dog downloader set on tow and on performance, and set in tow with the Outlook Monitor adjusted to 0% power.



Does anyone have any suggestions on what this might be? Any adieas will be appreciated.
 
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