89 Cherokee Cruise cable adjustment

I have an 89 Cherokee Limited with 4.0, factory cruise control is surging when set and I looked under the hood and found a slack cable at the throttle body, could this be the cause of the problem ? can anyone tell me how to pickup the slack in the cable, thanks in advance

I´d check my vacuum canister and associated vacuum lines and the vacuum lines from the canister to the control unit. Then the control box and maybe adjust it if necessary.
There doesn't seem to be any reason for the cable to be any looser than it always was, is there?
Last tip, don't listen to me, mine has been broke for years, I was never interested enough to want to fix it.

all hoses intact,

The book says if there is any more than a 2 MPH cruise variance, the control module centering screw (under the dash, yellow box I think) needs adjusting. You are probably gonna need the book to do it.
There is also a vacuum release switch on the brake pedal, under the dash. Mine had some wiring tangled up in that area, from the last owner.
Do a search, I remember somebody posting the adjustment procedure, with pictures a couple of years ago.