Oil Separator 2001 Escape

[fsinz]

I recently replaced a vacuum line on my ford escape leading to what the ford parts man called an oil separator. This line had a large hole in it and now I get a whiff of oil like it was spilled on the engine block and the plugs seem to be fouling, the engine has trouble idling when cold. I ran some fuel injector cleaner through it and the problem went away until I put regular gas in it. I replaced the Idle Control Valve but this did not help.