ORIGINAL: Camel3g GT

Alright about a 2 weeks ago i got a light on my car took it to get a computer check it turned out to be a random misfire in a cylinder but they couldnt pin point it. So today at a stop light just sitting there my light goes on and the car started to rumble n shake..i thought i could of been running out of gas beings i was pretty low on fuel liek on the E line. I added 10$ into the tank went to start it and it rumbled a second and started up it was a little rough at the beginning and then it ran perfectly fine i took it for a drive and everything seems alright although the check engine light is still on. I also pulled my plug wires off at the gas station and noticed some oil. Any tips on to what it could be