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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 10-23-2011, 09:44 PM   #11
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Lean codes are generally caused by intake leaks past the MAF, such as intake gaskets or vacuum lines.
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Old 10-23-2011, 10:21 PM   #12
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i was told that by someone else as well. but i was told it could be a vacuum leak. but when i sprayed around behind the maf with carb cleaner the ideal never changed. so after that i thought it could be a fuel problem. so changed out fuel filter and spark plugs and that didn't fix it.

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