Your problem is most likely under the hood not at the controls.
I would pop the hood and look on the drivers side right below the throttle body. Connection 5 usually is the source as it comes loose and falls of the nipple at the intake.
If that is connected then you can follow the line from there, across the firewall to the box (number 8) which is in the frame right below the battery. Sometimes battery acid corrodes the tubing there, simply pull it off then put a new piece on.
This connection is actually easier to see if you lay under the Jeep right behind the passenger front tire and just look up along the frame/firewall.
But my money is usually on the intake port (number 5), if it is the problem I would put it back on the ziptie it to hold it tighter.