Cadillac Repair: electronic fuel injection 1976 Cadillac, electronic fuel injection, vacuum line

Question
Are the Kent-MooreJ 25400 analyzers and harnesses still available? 1976 Cadillac 500 cu.in.  

What is likely cause of stumbling off idle when the engine is warmed up?

Any good sources for new/used fuel injection parts?  

Answer
I doubt the harnesses are availabkle.

stumbling is usually caused by:

TPS.
AIR TEMP SENSOR.
LEAK in the vacuum line going to the computer.

NOTE: NEVER run the engine with the vacuum line DISCONNECTED from the computer or you will destroy the computer.