So the other day my check engine light came on, and the code that was spit out was a p 0305 cylinder 5 misfire. When I first got the car, it had a mis, and they threw in some cylinder cleaner and it went away. Came back on once I think during the summer but went away, until now. Is this anything to worry about? I figure it's not, until the light never goes off.

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2003 Jeep Liberty Renegade, Silver/Black
2008 VW GTI 6MT, Black magic/interlagos

Change a coil with another and see if the code changes to that cylinder. If it does then its a coil.

Ever change the plugs? They should be changed every 30k.

How many miles are on it?

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster

Search the TSB, Warranty and Recall section. I know there were problems on the 05 and 06 models (mine included) that needed to have the valves/valve locks replaced. Your issue could be related.

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Sold the Audi, bought an '05 Sport
OME rear and front hybrid lift
245/70-16 Destination AT