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If it is burning your eyes it is way too rich. Unless you are burning oil as well. When adjusted properly, unless you have a big cam in the engine, you should be able to start the engine and let it run with the garage doors down. It should run that clean. Think about warehouses running propane forklifts, in the winter they keep the doors closed to keep the heat in with no extra ventilation. I would check for vacuum leaks at the throttle body and manifold. See if the throttle shaft will move around in the base. If so the idle mixture will be rich to compensate for the air leak.