Please confirm what is supposed to be plugged in here? (PIC)

[SummerallGuard04]

What goes here? Noticed this today, should have noticed it earlier:

 

[SJC]

Mine goes to the stock air intake box thing, plugs in

 

[1985taylor1925]

thats where the popsicle machine hooks up

 

[Singtoe]

I believe that it is cruise control plug. Does your truck have cruise?

 

[Millerad1651]

/\/\/\/\ Didn't you say in an earlier post that your cruise control wasn't working? Maybe that is why.