Misfire cylinder 8

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smith

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Having a misfire on cylinder 8. 2013 Expedition with 5.4 V-8. Replaced coil and plug still getting misfire. Any suggestions?
 

Hamfisted

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No coolant leaks from the heater hose dripping down into the sparkplug well right ? Any other DTC codes ? How many miles on it ? Timing chains done yet ?
 
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smith

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No coolant leaks. 135000 miles. no timing chains done. no other codes.
 
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