The MAF on my 4.0L actually went bad a few months back. I tried cleaning it several times but without luck. I bought a used one on Ebay for about $30 and that worked great. You just have to make sure it has the same part number and the correct version number.
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Yeah, there are different versions of MAF, with small film inside ore with nicel-chrom hair ore othe type....

ECM is parametrized for relevant MAF.