White sour exhaust? Help!

2010 CX-9 3.7L. Has white sour smelling exhaust. Had a code #6 cylinder misfire. Replaced plugs. Worn but evenly browned. Oil is not milky.

Any possible causes or problems? Greatly appreciated.

Don
 
Head gasket would be my guess. White smoke can be caused by coolant getting into a cylinder. Are you losing coolant?
 
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