[truegearhead]

Last week I drove my boxster back from the airport after it sat for a week. It ran on 5 cylinders the whole way home(30 minutes). The next morning a replaced the plugs O2 sensors and 1 suspect coil(plastic housing was cracked). When I started the car back up it ran great. The next morning the se misfire came back, but after 30 seconds or so I turned the car off and back on and the misfire disappeared. The check engine light isn't on which makes me think it's been removed(ooch). Any ideas before I take it to the shop?