P0300 code

[bhayes1]

During a family road trip my check engine light came on so I ran the code and it came back as P0300 random misfire. I filled up at a shady place so I figured maybe I got some water in my tank. Ran a can of sea foam through it and it cleared it but came back shortly after.

Truck couldn't possibly be running any better. No missing, sputtering etc.

From what I read this code is hard to diagnose because it doesn't give you a specific cylinder as a starting point. I hate to just start throwing parts at a truck that runs so good. Anyone have any tips....