RPM goes to 0 and the engine shut off,really hard to turn on. What's wrong?

You really need a shop to retrieve the Check Engine Light code, even if the Light is not on, there can/will be a code. or guessing will make you poorer and poorer. Most often the thing I look for with this symptom in this type of vehicle is a defective Crank Sensor, very very common on this car. here is a link to an article that explains what the light really means. http://repairpal.com/check-engine-light

HOOK UP A SCANNER AND CHECK FOR CODES ALSO LOOK AT LONG TERM FUEL TRIM ON THE SCANNER