On a cold start the divorced choke coil MUST snap the choke flap tightly closed AND at the same time lift the fast idle cam to the highest position.
As soon as the engine starts the choke pull-off opens the choke flap just far enough the engine runs on it's own without stalling out. So the choke opening angle must also be set correctly.
Do NOT hold the throttle open to assist a cold start. Set the fast idle speed instead.
IF you try to help it by applying throttle it will allow the fast idle cam to drop to the next lowest step on the cam and once the engine starts it may not stay running on it's own.
Although those early units are a bit primitive compared to later designs they work flawlessly once you set everything correctly......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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