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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#9
Wed, February 23rd, 2011, 09:24 PM
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welcome to the club. 08 Screw 5.4L same issue. Only 17 thousand miles so it isn't plugs or dirty intake. Gryphon works fine on canned tunes, its the custom 87 tow tune that causes my isue.
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