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.

[timothy_nd28]

(IMG:style_emoticons/default/agree.gif) mostly with what Valy said except the AFM adjustment. Idle adjustment is typically done on a big adjustment screw on the throttle body. The AFM adjustment screw really shouldn't be messed with, unless you have an AF gauge and have read the AFM pdf bible 3-4 times. Black22 has this pdf, if you PM him, I'm sure he will share with you.

Being that you have a 1911 (so do I), you may have to mess with the AFM anyways to loosen the clock spring a few teeth, to richen the mixture. With that said, save this step until the last resort.

Follow Valy's suggestions except the AFM adjustment. Then, I would temporary remove the aux air valve from the system by removing the hoses and capping the plenum with a rubber cap, and cap the plastic T at the S boot. This will help isolate what I think may be causing your issue.