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while driving my jeep the other day , the engine just shut down, no chugging or nothing, just shut off like the key did it. it started back up and drove fine for the rest of the day. the next day it did it again but 4 times,all restarted but on the 5time it died it was done, didnt restart. towed it home.i replaced the crank shaftsensor,pickup coil,plugs,wires.had the coil tested,fuel pump is good,pressure is good,injectors are good and so is power to them. i dont know what else to do.. please help.  

Thats alot of money spent to just randomly replace parts....but anyways, this is a problem with the Grand Cherokee that usually relates to the crank position sensor, but if you have already swapped your out, then im not sure.  

Do all the gauges zero out when this happens?  

no all gauges and such work fine, but  i removed all wires and plugs , cap and rotor and double checked everything i did and i have spark to my plugs but it wont fire up, just turns and turns and turns hehehe  

Have you checked the ignition switch, fuses, etc...?  Did you hook up a noid light to the injectors to make sure they're firing?  

You also might want to check your ASD Relay.