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You might want to adjust your starting procedure. On my '70T, I get great results with the following: if I haven't run the car in a few days or weeks, turn the key to the 'on' position and wait about five seconds so fuel pressure builds and float bowls are full. Give the gas pedal a couple of pumps. Then wait a few seconds (you want fuel vapor in the intake), then start it with your foot pressing the gas pedal down around halfway. On my car, it fires up almost instantly. As for cold idle, it's never going to take care of itself. You can either use the hand throttle or just don't let it die for the first minute until it's warm enough. My car idles fine after about a minute.
Something I didn't realize before I got a carbureted 911 is that fuel evaporates from the float bowls pretty quickly. On my car, if it's been sitting for a few weeks, the bowls are basically empty. You have to let the fuel pump refill the bowls, and I find it helps to do this even if it's been sitting a few days. FWIW, I'm running stock ignition and points and it starts perfectly every time....if I do the above procedure.
As for hot starts, those are harder. I give it a couple of pumps and then hold the gas down halfway and crank. I have not found a way to start it without 2-3 seconds of cranking. If anyone has any suggestions, I'm all ears.
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