Holy Crap I am tearing apart the 99 disco I just got an I did a comp. test on all the cylinders......they all read about the same 90 give or take per cyl:eek::eek::eek: there is nothing wrong with the meter took it over to my wifes new acura and it read a tad over factory specs. This is very bizzare this kind of worries me could the heads be so warped from overheating that they are just all warped to crap and just so happen to ALL be that low?????
I really doubt it.......

I had an f-150 with a timing chain that was so loose it jumped a few teeth and compression dropped on all 8 cylinders.

Hopefully thats not the case with your disco. They are interference engines and more than a few teeth and you'll be buying valves, maybe pistons.

will it run? any backfiring? how many miles does it have? When did it start?