2000 jgc stalling issues

hello i really need help i just lost my job and traded my car for this 2000 jgc. after multiple parts and money later i am really frustrated. while drive the jeep out of no where i lose all power the vehucle begins to shudder and shake ecspecially when i hit the gas. i have taken it to the dealer and they were sure it wasnt the pcm which is what i took it to them for in the first place. instead they said they were 90% sure it was the ignition coil assembly. i replaced this and guess what still have the problem. the crankshaft sensor, tranny, battery, alt,radiator, waterpump, and tranny cooler have all been replaced. it weird cause it doesnt do it all the time mainly after ive been driving and the come to a city with multiple stop lights or heavy traffic in which i am setting still which is letting my know that whatever it is, is getting too hot and causing me to shut down. help would be greatly appreciated. my wife wants me to sell and i really love the truck. the pcm was flashed by the dealer and cleared of all codes and then came right back on. thanks again