I have a 1999 Ford F150 with the 5.4 motor . the truck has 180,000 miles on it.About a week ago it started to misfire under a load.The check engine lihgt finally came on with a code of misfire on cylinder #1.I changed the coil pack on that cylinder with no change.Then i swapped the new coil pack with another just to be safe with still no change.the misfire is getting increasingly worse and now the check engine light flashes.
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