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steady missfire at idle and underload
I have checked all coils for breakdown with lab scope
pattern good, tested all coils by swapping good coil to all
cylinders no change. Removed spark plugs all show sign of
fuel fouling, checked compression all 165-175 psi. No DTCs
set. 
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| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1999 Ford Econoline Super Duty Custom 5.4L
| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
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