Hey whatsup everyone, so this weekend my truck started misfiring pretty bad and running rough, i checked the codes and im getting the p0305 (cyl. 5 misfire detected) and the p0316 (misfire detected at 1000 rev. of crank). I have a 2002 f-150 ext. cab 5.4 liter. I have read and found alot of posts about this topic, but have not read one that resolves this issue. can soeone please help me out here?

 

Start with new spark plugs, then look at the COP's.