so a few weeks ago I got a CEL for cylinder 2 misfire, and my car hadn't been running that great at about 53k miles. So I disc. the battery, changed the plugs, and all was fine (code cleared). Then I drove it to the store and when I started it again it bogged down (almost died) and CEL came BACK on. This time it's showing P0456 for EVAP small leak. I had the gas cap on tight, don't get it. So I don't know if it's just coincidence since it's an un-related code to the prior. I ordered a gas cap off the internet jik (hell it was $5 w/shipping)! Car's driven fine since (about a week now). CEL hasn't gone away.