carb air leak?, occasioally surging idle Options

[VaccaRabite]

I am having a weird issue with my carbs.

They will go along fine at 1100 RPM idle all day. Suddenly I will stop at a sign or red light and the idle will climb from 1100 to 1700 and my car will start making unsynced carb noises. Sometimes it will settle back town if I tap the gas peddle, sometimes not. Once the idle surges, it will be like that for a while when I stop, and then it will suddenly drop back down to 1100 RPM and and behave nicely.

I am guessing that I have an intermittant air leak in one of my carbs. Anything else I need to be looking at?

My theories, in order of what I think is likely:
1) air leak somewhere
2) gas leaking past the inlet valve
3) weirdness with the linkage

I have not been able to recreate the issue at home, its always when I am on the road so I don't yet know which carb is acting up. Its worse if I am driving the car hard, but will happen when I am just cruising around town some too.

Ideas?

Zach

[bobhasissues]

I had similar issues and found that if the "arms" that connect your throttle shafts to your drop links have any rotational play in them then you'll never get the carbs right. To check, disconnect the drop links and hold your idle speed adjusting screw against the stop and try to move your carb arms. If they have free play you will never get the carbs to synch up right. Good luck.