OK, problem to date:  '82 Westy, air-cooled, no oxygen sensor (no connector for it).  Engine starts and runs fine when ambient temperature is under 70F.  When engine warms up, begins to miss, run rich, and finally chokes out.  When ambient temperature is over 70F, engine starts badly, misses, smokes and chokes out.

Attempts to date:
Replaced -- Temp Sensor #2
                  Plugs
                  Points & condenser
                  Rotor & Cap
                  
Checked per Haynes -- AFM
                                  Cold Start Valve
                                  Fuel Injectors
                                  Aux. Air Valve
                                  Thermo Time Switch
All meet electrical specs at each point and checking from the harness per the book.

Question:  Whats Left? Combi Relay?, Fuel Pressure Regulator?
Any assistance would be helpful.

P.S.
I have also checked and cleaned all ground straps from battery compartment and from the tranny.
                 

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