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I've had a k&N CAI on my truck for 2 years and never had the MAF problem you are describing, when oiling the filter just oil enough to have a bit of a pink/red color even over the filter, basically lightly oil it!! Also pick yourself up some MAF specific spray cleaner for your MAF, spray it all out pretty good, don't touch the little wires in the MAF and DO NOT USE COMPRESSED AIR AT ALL, just let it air dry!!