99 4.0 No Start

I am trying to fix an XJ parked in hostile territory. A friend of a friend of a friend had the back window of her Cherokee removed by a malicious brick-toting neighbor. The Cherokee has not started since the incident. I was able to get it started if I kept my foot on the gas but it shuts down if I let off. What am I looking at here? Bad IAC, TPS, Crank Sensor, or some type of security sys. I am looking to get her Jeep out of there quickly since the neighbors are unstable and are likely to attack anyone. I really am beginning to hate being a good Samaritan. Thanks for your help.

Get a cop and a flat bed, fast, at a minimum have a cell phone camera with you

It was the crank position sensor. So the Jeep has been moved to safer grounds. Thanks.