Down low on the right rear side of the engine is the
Altitude Jumper Wire, a black and white wire with a large
eyelet connector on it, hanging out of the wire harness.
If you are operating the Jeep above 4,000 feet, you are
supposed to ground this to the nearby bolt on the engine
block, where you will see some other wires grounded. This
tells the computer to make adjustments for the thinner
air. At lower altitudes, make sure this wire is secured
to a harness or some other insulator, and is not dangling
where it might come in contact with a ground.