I must be the only person to ever have problems with a miata. I bought a 94 three years, with 94k on it. I only was able to drive the car about a month before it started blowing oil out the exhaust. So I had to rebuild the motor, while in there I replaced the clutch and flywheel. Wouldn't you know now the clutch feels soft and slips, I bled and bled the system and to no avial. So the car sits again, untill I can tear it all apart. Also the car has now developed a lovely charging issue. I have not had good luck with them in my short ownership, fun car in the corners when it runs.
Good luck to you.