I recently bought a 1993 Mazda mx6 with the FS-DE motor. On the drive home, I noticed that every time I pushed in the clutch and the rpms fell, they just kept falling until they reached 0 and the car shut off. I discovered that if I push in the clutch, take it out of gear, and pump the throttle a couple of times, then let it fall, it doesn't die. Also, it idles relatively low. (Around 600-700 rpms) Anyone else had this problem? What could it be?