Why does my engine die when stopping?

Wow; thanks again for the great info.
I must say, it is now a pleasure to drive the car since it is no longer stalling-out at stops.
It tries to stall-out (just to make me mad), but doesn't quite succeed, and then it rebounds to a nice idle after about 5 seconds after almost, but not quite stalling out.
However, I do want to find and fix the vacuum leak so that I can use my wiper motor.
 
I am reviving tis thread because I have the same problem. When I coast down hill to a stop the engine quits. I have been over my jets many times including flow testing and don't think the problem is there. But examining the carb itself (original) I find the throttle shaft has about .005" slop side to side and the idle air mixture screw (a new part) is loose about .005" in the casting thread. Could these clearances be enough to cause my problem? I have electric wipers but I haven't checked my manifold/engine interface yet.
Also I am told I should raise my advance/retard lever full up when I come to a stop. I have never heard of that. Thanks Bill G
 
Usually float level being too high is the main cause. Lowering the level of fuel in the bowl of the carburetor usually solves the problem
 
Your symptoms are identical to the ones that drove me nuts a few months ago. A Model A guru (not on this site) told me the instant I told him about it that I had a leak in the inlet. I didn't believe him and spent weeks chasing down all sorts of things, many of which have been mentioned by others here. Out of desperation, I took the manifolds off had them faced and refitted them with a new gasket. PERFECT.
When I next saw him, he asked how I went. I sheepishly told him he was right!!!
 
SAME PROBLEM with my carb:
Idle speed screw is the screw on the throttle lever. Air/fuel screw is the one with the spring on it.
Turn air/fuel screw out 1 1/2 turns from seat. Start engine and let warm up.
Reduce the engine speed with the idle speed screw as low as possible without stalling.
Turn a/f screw in slowly until engine speed changes, then turn out until speed changes. Set at mid point.
Reduce engine idle speed as low as possible without stalling.
Again turn a/f screw in until engine speed changes, then out until it changes. set at mid point.
Return to idle speed screw and reduce engine speed as slow as possible.
Work back and forth between the two screws until engine runs as smooth and as slow as possible.
If the speed is too slow for normal driving, increase the idle speed.
 
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