"Worn out"
Do a leak down test on it and see what kind of presures you come up with. We have a trooper in the family with 350K on it. brought it back from the dead several times. 327 valve springs and a new timing chain can work wonders. Low compresion dont bother.

3 90 Trooper V-6's, 5 speed, 4.3L TBI, 31" BFG AT's, Fender Flairs, Bored intake, 1.6 roller rockers, MSD Coil, Jacobs Omni ignition. Heavy duty torsion bars, Rancho 9000 Shocks CAN'T SPELL, TO OLD TO LEARN, GOD BLESS YOU IF YOU CAN.