PO355 weird diagnosis

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WrenchinBrit

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Location
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Hey All
Expedition king ranch XLT EL HD TOW 5.4 3v
Got a CEL after lumpy idle and code came up PO351 coil A
No worries .. pulled the coil pack and switch to the front on passenger side.

(checked the plug also .. good color and they’d all been replaced about 15-20k ago)


Cleared code and it threw the light again
With PO355 coil E
Happy days I thought and ordered a motor craft OEM and put it in ..
still the same fault ?? With the same lumpy idle.
Replaced with original same symptoms..
does this ring a bell with anyone ??
 
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