I am having a big problem with my grand cherokee when I stop. When I am at a light or making a stop, my jeep turns off. I do not know what it is but I do notice that the RPM drops down when I am stopped so I am guessing that makes it turn off. But I am wondering what I can buy that can fix this problem. I have read that it can be the crank sensor and then I also read the idle air control valve. I have changed the spark plugs, wires, and fuel treatment. I do not know what else it can be. I AM ALSO HAVING A PROBLEM WITH IT LEAKING WATER. I think that the water pump but I am not sure. I did just replace the radiator. My check engine light is not on. The jeep is riding very rough and I am wondering if I replace both of these things will that maybe help the problem. If anyone is a mechanic and does not mind me emailing you with my questions about this jeep please email me at [email protected].. THANKS SO MUCH