O2 sensor extra wire

Hello guys, quick question here. I was looking around my engine back the other day checking the air filter, spark plug wire connections and any other loose bolts or anything unusual during the inspection. I came across what seems to be maybe a ground wire that was not plugged in. The connection was tracked down and it was connected to the O2 sensor, My truck does have a bit of a stumble during acceleration. Everything on the car seems to be in tact and was thinking maybe this extra unknown wire maybe we the culprit to my trucks stumbling issues during accelerations.

That's a ground that should be connected to the frame on one end, and the engine block on the other.
Poor grounds can wreak all kinds of havoc.

ok thats what I was thinking it it was a ground, but not too sure. ok well ill definitely get that grounded tonight. thanks for the info

Hey guys just wanted to update this thread and to confirm that I did ground that loose wire on to the frame. In results my truck does not stumple or bog anymore .