Just happily got my car back and breaking in the engine

right? It just so happens that at a random time when I was coming to a complete stop because of a yellow my car suddenly shuts off. Everything in the car is still working though... odd, I think to myself. I try to start the car again but what I noticed is that the RPM gauge isn't bouncing up like its supposed to be. Thanks to a tip from a buddy I checked the fuses to see if any were blown from the engine. None... So after sitting on the side of the road for a bit I try again to turn on the car and this time the RPM gauge comes back up and it starts again! This happened to me 3 times today randomly throughout the day. Could it be that the injectors happen to cut off fuel? help will be much appreciated.