I have a 2002 3.0 liter Flex Fuel that is giving me issues Idling (hesitation; out-of-time type idle) and running, but not consistently. I was thinking about my MAF, but it is clearly stamped on the outside not to clean the inside. Has anyone ever used the MAF cleaner products they sell with success?

Past history: It all started out with a check engine light coming on and I am told is is just saying 'Cylliner 5 Miss-fire'. Anyone ever get this error along with engine idle/timing type issues?