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Originally posted by Digger
The fuel pump is mechanical so the choke is not opening too soon
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I believe you, but that doesn't make any sense to me. What do you mean?
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it does the same thing even with my manual choke 750 performer. The choke is operating properly, you can see it slowly open.
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I still believe you.
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The car will run rough all the time until you shut it off and resart it, or leave it in first and drive it at 3000 rpm for 15-20 seconds, even this does not work sometimes. The car will run rough even if you let it get up to operating temp. It does not gradully get better, it runs rough or it runs perfect, more often rough.If any other info is required just ask.
Digger
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If you can get your hands on a hand vacuum pump, remove the distributor cap and unplug the vac advance hose. Attach the pump hose to the vac advance port on the distributor and slowly apply vacuum. Does the assembly rotate smoothly? Release the vacuum. Does it return smoothly?
Are you sure your vacuum lines are correct (ported vs. mani)? Have you checked them with a gauge to verify the correct vacuum?
It's reaching a little, but you could have an obstruction in a vacuum line or port.
This won't be that tough. How do the plugs look? Does the rough running resemble a rich condition, a lean condition, or a timing issue?