CRC makes a spray cleaner for the MAF which you can buy at any auto parts store. Dirty little secret in the auto repair industry is that you can use that stuff the clean the MAF and more often than not it will work...so it is worth a try.

You might also check the airbox that the air filter is in for warpage. Mine is warped and I need to use extreme caution to get it to seal perfectly.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz