List, thanks for the info on getting my car to settle down. here is everything i wound up having to correct to get it running right: 1. switch two vacuum hoses which were somehow routed wrong (how i missed that i will never know) 2. recrimp connectors to the back of the idle speed switch. one was loose and not making a good connection all the time. this made my advance solenoid get a ground and now it energizes all the time and cuts off vacuum to the distributor advance when hot. 3. since the advance was always F'd up, i had to reset base timing. it was retarded 5 degrees. 4. had to remove both stop screws on the throttle and reset. turns out throttle plates were cracked a little at idle and causing too much air to enter when the idle motor was running as well. so as you can see, as is typical with these cars, i was suffering from a number of problems all at once. now that i tackled each one, one at a time, my car runs WAY smoother, my exhaust smells normal, i bet my gas milage will go way up now that my vacuum advance works right!!!! Thanks List, Andy [Non-text portions of this message have been removed]