Quote:
Originally Posted by Classics Fan
I checked the power brake booster hose assembly but totally missed the transmission modulator. Good tip. My vacuum gauge doubles as a pressure gauge, I will see if I can make that work. Thanks!
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Its not just the booster hose. The booster proper can develop an internal leak bad enough to cause idle issues. At the same time, it can still work well enough that you assume it is good. Quick test: With the motor running, push the brakes a couple of times to get the feel. Turn motor off. Leave for a couple of minutes. Then with the motor still off, press and release the brakes just like you did with the motor running. The feel should be the same and you should hear a hiss from under the dash. A harder feel and/or no hiss indicate a possible booster problem. A 2nd test but more work is pull the booster hose and cap the carb/manifold fitting. If your idle gets better, probably a leaky booster.
But with your initial symptom list, a fuel flow problem was one of the things I thought of first.