general problems of the 1996 Jeep Laredo

I own a 96 Jeep grand cherokee and about 6 weeks ago it began to cut off while driving, total loss of power. The Jeep has been in the shop off and on for these 6 weeks since the first incident, I have spent approx. $600 trying to rectify the problem, then I received a recall from Chrysler for a problem with the catalytic converter, so I took Jeep to local dealer to get repair done and they tell me that they are "95 % sure" that the converter is the problem with my Jeep cutting off. Now the complaint, they do not have the part to fix my Jeep. Dealer tells me he can only order one part a week and he's not sure that one is going to come in. Dealer tells me to call Chrysler. When I call Chrysler they tell me to call other local dealers to see if they have a part, well what do you think their answer is? yeah, I don't have one. My Jeep is not drivable and Chrysler doesn't want to do anything about it. Luckily, so far, there has not been any accidents. Two close calls, one nearly a head on collision,but no accidents yet. Can you help or direct me to someone who can. Thanks joe fitzgerald.