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I am working on a 2021 F-150 with a 5.4L 3v engine for a customer. I rebuilt the transmission for him, which is working great now. I drove the truck for 2 days after the rebuild to make sure everything was working. It sat for 2 days, then I started it to move it this morning. After starting the engine made a very loud clatter noise, started running rough, started stalling and finally died, cranks by no start. code p0301 is stored for cylinder #1 misfire. It sounds very much like it jumped time.
would cam phasers cause this? if so, how do I test them?
 
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