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1999 Ford Expedition Question: What can I do to fix this problem

 

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915tommyboy74, 5.4L V8, El Paso, TX, April 04, 2013, 14:59
 Rookie

Got a PO353, PO356,PO358 after changing all Spark Plugs and all Coil on Plugs, also getting misfire when gas pedal is released
Starts up fine
Checked connects look okay
Checked spark plugs look okay
Checked wiring

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  • Answer #1

    arturo08 April 04, 2013, 16:57
    Profile_thumbnail
     Master

    rec. fuel system clean. ethanol treatment to 1 tank premium fuel. get fuel running through clean to eliminate fouled injectors as possibility.

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    915tommyboy74, April 04, 2013, 19:52
     Rookie

    I also cleaned tank and lines, also new injectors,new EGR Valve, Trottle position sensor, EGR Position sensor, ICV what else can be done

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