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If you don't have one already, unplugging the FCV will cause a Check Engine Light. It should run fine with the valve unplugged. You might want to take the intake hose loose and look to make sure the valve is in the open position. They can fail open or closed, but open seems to be more common. If it was full closed the engine wouldn't run. Partially closed would make it run poorly.
_________________ Matt B.
05 Limited CRD. Bought it new. 112k on the clock now.
GDE Eco-tune, rear differential drain plug (drilled and tapped the pumpkin), transmission pan drain plug, Fumoto oil valve, fuel filler neck restriction removed, front hitch, Hayden fan clutch, Sears P1 battery since 08, Mobil 1 5w40, 5 volt glow plugs, DIY timing belt at 109k
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