I discovered the REAR coil & spark plug on the passenger side somehow was full of water. It seems its a common trend in the 5.4 and the V10 that the rear plugs and/or the coil over plugs go bad because of water dripping in from the cowel.
After purchasing your new coils and plugs it is a simple job, Its just very Time comsuming it get the plugs removed and replaced. you should be able to figure it out quickly. ALSO new coils come with a new boot.
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