Engine: 2.0 ABA block, 1.8 head, Digifant II.

I recently replaced the head gasket.  The head was skimmmed flat.  ARP studs.  All looking good.

- Timing good
- Temp II sensor tested good
- Throttle switches work fine - tested.
- Idle control valve buzzes
- O2 heated sensor produces voltage.  Swapped with my spare and no difference.
- Re-checked grounds that I could see.
- No vacuum leaks that I can see. 
- New plugs
- New wires
- New rotor and button

Symptoms:

-  Engine will not idle until it warms up a little.
-  Engine runs well above idle
-  When unplug Temp II sensor rpm drops, engine sputters and dies.
- Sometimes if rpm drops, engine will sputter/stumble, sound like it’s very “cammy”, then clear up.

I’m stumped.  

All connections are connected.  I cleaned the throttle body with carb cleaner.  Could I have clogged something?  Some o-ring did not like the carb cleaner?  Do I have an exhaust leak north of O2 sensor that I can’t hear?  I did loosen and re-torque the header for better sealing.