The other day I was on the highway and it just started misfiring. It seems to be hit and miss. No rough starts, fires right up and drives sometimes it will start cutting out right away some times it takes a little bit. Had codes ran giving me a P0304 on Cyc4 misfire. Any suggestions on where to start? It also has cam sensor codes about 4 of them that it has had forever, haven't had time or place to get into fixing all the timing problems. Car has 250k.

 

Sorry I forgot to mention it's a 1.9T 2000 S40

 

When is the last time you gave it a tune up? 2 coils, 2 spark plug wires, and 4 spark plugs.

 

It's my fiancee's car and I feel like not in a long time. I*changed the plugs about a year ago.