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Does the RotoStart turn without being in the engine? If so, turn the flywheel backwards to take the piston out of its' compression stroke.
Your battery would also have weakened if left out in the cold.
I ran into a very similar problem. If Rolex's suggestions don't cure your ails pull your glow plug and turn the rig upside down then try the RotoStart. In my case the fuel gravity fed the carb while I was away, flooding the engine.
Now go apologize to it for calling it a "Salvage"! One good WOT run into your shin for punishment!