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If you do much short trip driving, the engine doesn't really get up to operating temp long enough to get rid of moisture in the crank case. That could be a reason for the "mustard" you see.
Youngest Daughter came home a few days ago saying her 2007 2.2L ION was loosing power while driving, also said it was sputtering. So I "CLEANED"! the throttle body. All is good..
You're asking a guy who posted that 5 years ago.
It's possible he could still be on the forum.
But Rj has left us.
19Bonestock88 should be by to answer soon.