Those low vacuum readings at start up bother me...

Maladjusted valves could cause... do check them, and re-torque the head. Check the intake manifold bolts for tightness.

You might try eliminating sources of vacuum leaks by pulling and plugging lines... maybe one of the vsv's or the canister, or perhaps the brake booster has sprung a leak ?

C/YA!
Jeff
'88 Trooper
2DR LWB 4ZE1 5SP
bone stock DD