I also think you could have a faulty connection where your wiring harness meets the ECM, this connector is located on the passenger side firewall. Have someone start your vehicle while you move the wiring harness to ECM connector. If it stalls then you have what I found to be a common problem with grand cherokees that stall or stop running. To fix this problem you will have to move the wires one by one until you find the faulty connection or connections. Mark the wires and then replace the pins on the harness one at time. It is usually the wires to the coil or map or distributor or crank - cam sensors. This is a simple but time consuming repair that most mechanics never find.

I found the above on another site..gooGle is our friend..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />