I have a 2000 jeep grand cherokee laredo
it is inline 6 4.0L
it cranks and turns, sounds like alot of misfiring going on, wont start.

here is all the info I have pulled for now:
battery is good (have it charged up to 250 amp big battery charger, and more)

fuel pressure is 39psi with ignition ON, and 49psi-80psi when cranking. I also hear the fuel pump go with ignition ON, so probably good. also there is half tank of gas...when turned off, the pressure sometimes drops a psi or 2 but stays fairly steady afterwards

compression test shows 120-150psi on cylinders (I think I checked first 4)

all the fuses work (some need to be cranking, like the fuel injector fuse)

the ignition coil rail (no spark plug wires/distrib cap) works. Checked power to the rail (get 12-14v when cranking, so supposedly rail and crankshaft position sensor should be good) and also bought a new one just to be sure as I wasn't sure if it was sparking

spark plug wires are dry and black, really black (and week old)

fuel injectors get 10-13 ohms of resistance, seems to be good by what I hear

swapped around asd and tcm relay (asd for fuel injectors according to book, same thing happening)

crankcase vent valve (front one) is busted, but I wouldn't think it has any effect on starting, probably would run rougher

took off air intake/filters/air hoses, still nothing

poured a bit of gas into the throttle body, when cranks you can see a bit of fire there, but nothing

when I crank for a longer time (5 seconds) the throttle body area explodes, big poof, and one hose usually gets popped off from pressure

had 2 codes earlier when scaned, P0340 and P1391, but after deleting them 3 days ago, they havent appeared

wednesday, the car would start after 4 or 5 longer cranks (we assumed it was to get fuel pressure, were guessing fuel pump gone) and would start but would die within 10 seconds, then again after 4 or 5, and then never again (heard something blow, and it was the throttle body area mentioned). Didn't touch the car until saturday morning afterwards.

what is there left to check? could it be timing? does it use belt or chain, and would that have any impact on starting and could it be that bad off if it started earlier.
could the spark plugs be sparing too early? and dry/black, too rich, maybe there is no air? But we opened up whole throttle body and everything, took off air intakes and all, and still nothing. Could fuel filter affect even if the fuel pump seems to work and get enough pressure (hasn't been changed since bought, now has 220KM, about 135k miles). The valve, not sure whats it called but is totally broken, its like a pcv valve but its not and theres 2 of them, shouldnt affect starting I believe.

any ideas? i am really starting to be lost, I have a few ideas left, like neutral safety switch, map sensor, pcm, but there is less and less ideas as I am slowly testing everything one and twice over

edit: when cranking , or turning ignition to start, i dont hear any click of swirl sound from the injectors (should I?) as I hear them on some of my other cars