codes 303 &404

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10-30-2010, 04:45 PM

w00dbutcher

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codes 303 &404

I drive a 97 supercab 4x4 5.4 w/170,000 miles . Tuned 4 months ago. It is running rough at idle and high speed codes 303 and404 where to start?

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10-31-2010, 09:18 AM

Ron W.

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When is the last time you tuned it up?
Change the plugs and replace the coil boots while your there, with luck problem solved. If it still misfires coils for the 2 rear cylinders on the passenger side.

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