Miss Fire Cylinder "4"

Let me start off by say my truck was driving flawless this morning when I left to run to a friends house. I came back and had nothing better to do so I figured I would make use of this nice day to clean my K&N filter. I did all the steps of cleaning the filter done it 100 times lol. Let it fully dry and put it back it. Went for a quick test drive and about half way around the back my truck felt like it was running funny. So I stop and pull over and it idles like it is about to die but dosnt. At this point I took it back home and looked over all the hoses to see if I nocked one off or something. I did not find anything out of place so I hooked up a code reader and got this code "P0304 Cylinder 4 missfire"

My question now is could there be a hose off somewhere that would throw that code? I did my spark plugs 15k miles ago so I dont think they are bad just yet. Maybe its a coincidence and I need to change my plugs wires and I hope not the coils caus they are some coin!

Any other ideas would be great my truck is my daily driver now that I sold my bike so I need to fix it ASAP.

Thanks Bryce

 

found the problem!

 

What was it?

 

Yes, what was it a loose plug wire?