Please I need help on Jeep Grand Cherokee

I have a 1999 jeep grand cherokee 160000 miles on it 6 vyl. 4x4 It stalls when I slow up not all the time though some times it runs like a top and then again it will stall out when I'm doing 55 down the road and I will let it coast and it will start up again. And go just like nothing happened. The check engine light does not come. I replaced the cam sensor and am going to replace the crank sensor now. I need help desperately no one seems to know what to do and it is dangerous driving like that as I have 2 small children that are with me. Please help and I thank you so very much for anything you can advise me on. Thank you.