Magnum engine misshapes..,

When I checked the spark yesterday on the number six I unplugged the battery and cleared the code. I drove it to work today about 20 miles or so and no check engine. Still idled a tick rough but ran just fine. when I started up to go home it through the check engine light again and again ran fine for the most part just a little rough on the idle. Had code scanned and it was number six again so I believe the problem seems to be isolated...
I ordered new tune-up stuff cap rotor plugs wires coil. Not one to really throw parts at a vehicle to fix it but these things it could use anyways. So I'll start there...