Ok I own a NA 87 RX7. Whenever I crank the car in the morning time the car revs high then after it will rev at about 1K. Then maybe a few seconds later it shuts down on its own. The thing is, once the car warms up a little the car doesn't shut down but it idles at either 500 to 800 rpms (not sure if thats normal). Are there any ideas what the problem could be? And sorry for the poor description, this is my first time dealing with a rotary.