1911 L-jet. How to get a good Idle., What to do get a 900 to 1000 rpm idle? Options

[tach]

I can not seem to get the idle where it should be. Its idle is either to high 1350 rpm or to low, as to where it will eventually quit running. The engine runs great with plenty of steady power thru out the power band.

What to do get a 850 to 1000 rpm idle?

1974 1.8 with these modifications.
1974 1.8 with larger pistons Keith Black pistons 1911
Stock L-jet.
8.2:1 CR.
Stock Bosch injectors.
Raby 9590 cam kit.
96mm Keith Black flat top pistons.
Stock distributor-Pertronix.
Stock heads, valves and valve diameters.
1.8 SS heat exchangers.
Triad Exhaust.
Newly rebuild engine.

[jcd914]

I would probably check the distributor and see if the centrifugal advance mechanism is hanging up or maybe the vacuum advance & points plate.
Some times they get sticky and hang advanced some as the engine comes down to idle. With the timing advanced (cause it hung up) the engine idles high. If you adjust it down lower the advance finally releases and timing drops to where it should be but now with the idle set low and the timing no longer advanced, it won't stay running.

Use a timing light to see what the timing does as the engine come down to idles and below.

Jim