hey guys, my focus is doing something out of the normal!!!!

basicly, when it starts up, and some times when i am driving, the hand barke light is not on, the car struggels alot!!! it hold back like its going to die, but when is comes on, everything is fine, and when it stays on will drive grate, my thoughts are that one of my calipers are seizing and needs time to "free" up, but when the light is off??

my fuel consumption is bad as well, got my fuel filter changed not that long ago but should i get my injectors reconditioned??

Any help of thought would be grate.