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2004 5.4 runs rough at 60 mph??????

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Old 03-12-2013, 07:32 PM
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2004 5.4 runs rough at 60 mph??????

Before and after this speed it runs fine, so what could it be. The check engine light is now on all the time.
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Old 03-12-2013, 09:10 PM
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If the check engine light is on, the first thing to do is ascertain what codes are being thrown. That should offer a clue.
 
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Old 03-14-2013, 09:14 AM
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Yeah take it somewhere that can read the code for free, but most likely it's plugs or a bad coil because of load while driving 60mph. I'd safely bet your code is for a cylinder misfire.
 
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