You need to do a leak down test. This test will let you know where the leakage is taking place. You can probably rent a leak down tester from the local auto parts chain, or HFT has one for $40-$50.

Once you find out where your leakage is you can start to fix it.

1987 trooper LS.'94 3.2, SAS,35's , lots of dents and rust. Now, improved, with more dents.
1995 trooper LS. Wife won't let me improve this one.
1996 trooper. I'll need something to modify when the '87 finally rusts away.