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Need some ideas on diagnosing fuel related.

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This morning truck started a little rough pulled out of the drive way noticed rail pressure going crazy it then dropped to about 3k almost died I went about a mile to turn around it would periodically drop to 3k and almost die about every 5 seconds. I didn't get to pull codes but no cel was on. The raptor was humming like usual. Also when I got home heard some injectors knocking obviously due to lack of pressure.
When I get home today I'm going to finish installing fuel pressure gauge replace fuel filter. I'm going to drain filter housing see if I'm getting fuel in there with key on. I also have an FCa laying around if these don't help. Any other ideas on what to check? I'm hoping to have a code thrown.

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