To make a long story short I have been posting messages for well over a month about the idle vibration on my 960 wagon (1997). Here is what i have done thanks to many of your suggestions with still no results. I am very appreciative of all the feedback and beleive there is a solution to this problem so here is where I am as of today:

Compression rings could this cause the vibration at idle ?

Original dry compression test indicated prior to valve job:
Cyl 1 = 175 psi
Cyl 2 = 125
Cyl 3 = 125
Cyl 4 = 175
Cyl 5 = 175
Cyl 6 = 175

Original diagnosis was a possible blown head gasket between numers 2 and 3. Replaced head gasket however it was not blown but very brittle. Poured mineral spitits into the top part of the valves and did see that mineral spirits leaked our of cyl's #2 and 3 and proceeded with a complete calve job. Car still has shimmy/vibration at idle.

Re-perfoemd dry compression test with replaced valves and recorded these numbers:
Dry:
Cyl 1 = 185 psi
Cyl 2 = 180
Cyl 3 = 175
Cyl 4 = 125
Cyl 5 = 125
Cyl 6 = 175

Why the change in psi from cylders 2 and 3 originally to cyl 4 and 5 now?

Performed wet test w/ oil here are the numbers:
Cyl 1 = 275 psi
Cyl 2 = 275
Cyl 3 = 275
Cyl 4 = 275
Cyl 5 = 275
Cyl 6 = 275

Does this mean the compression rings are shot? Would this cause the car to have a vibration at idle? Any insight is greatly appreciated.

Here is the history of what I have done over the last month.

Repaired:
motor mounts
intake manifold gasket
plugs, wires
head gasket
valve job

ruled out
O2 sensor (no reading on the wagon and no reading on my sedan which runs great).
coi and coil wires
idler valve
vaccum tubes
loose throttle cable
bad ground (mechanic swears it is mechanical and not electrical)