when i start my fc s4 in the morning(first start of the day) only one rotor works and the car keeps dying but when i rev up to 3k or 4k the second one turns on. also my car wont stay on when it cold only after it warms up it stays on any ideas?

 

Cold start equipment removed or malfunctioning. I really don't think one rotor isn't firing; you're probably just experiencing a rough idle.