Starts just fine(when cold), drive across town, shut her off. And it won't start back up, just turns over. When I let the motor cool off, after time, its starts again. For some reason when the Engine gets hot, the engine doesnt want to start. Another thing is when the motor gets hot, and your driving, if you come to a quick stop, the motor wants to stall. And when it stalls the car does not start back up, till its cooled off again anyway. I get no "Check Engine" light but I do get a "P1684" code on my odometer.
Can anyone help?

 

1684 is normal to occur. Your stalling sounds like clasic stuck egr valve sticking while hot.