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I told him "I pulled out the choke when it was cold in order to start it." He denied having touched the choke, and said "I'm going to die soon enough, I don't need to breathe that."
At that point I gave up and left. It seemed a waste to point out a second time that if he had pushed in the choke knob the choke light would extinguish. I would have expected an automotive technician to be familiar with the operation of a manual choke on a carbureted engine, even though it is outdated. I don't plan to take my vehicles there again.