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You have a garage? Yes? Good, now park your car in it. Get very long tube, then attach one end of it into exhaust and put the other end in your car. Try to isolate inside of your car from the outside as best as you can(it will keep more fumes inside of your car) . Turn engine on end enjoy last ride in your life.
Poisoning via CO has some funky mechanics- particles of CO attaches themselfs to red cells in your blood making them unable to transfer oxygen to your organs. At first you will feel sleepy due to lack of oxygen in your blood, then you fall asleep and eventually die if not rescued really fast.