[Barrycyr]

Can anyone identify the missing item that would be on the 1987 exhaust manifold? My truck runs rough when warmed up, I wonder if whatever is missing here would have anything to do with it.
2nd picture shows closer view of item I would like to identify.

 

[WalterS]

You have a oxygen sensor that is broken off.

 

[Barrycyr]

Thanks

Thank you, I'll try to replace it. I appreciate the input!