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Old Oct 13, 2006 | 06:48 PM
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Fordrunner99
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DTC Codes
I just had my 99 F150 4x4 5.4L act up running rough and giving 3 codes P0171, P0174 (sys too lean Bank 1 & 2) & p0304 Cyl. #3 misfire detected). Does anyone have any ideas what may be the problem/ solution to this problem.
 
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Old Oct 13, 2006 | 09:23 PM
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fmerkl
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check the rubber elbow under the plenum right behind the throttlebody, that's what I found on mine

Frank
 
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