My Particles Stop ?

i have a plane settup, and when you press a button, you speed up, and particles that look like flames appear behind the plane. But If i keep the button left down long enough, the particles just stop emitting, and won't work again. What's going on?

You've probably reached the maximum number of particles allowed in a single particle emitter. Emission will not work until some of the existing particles die off. Simple answer - turn down the emission rate, or make them die off quicker by giving them a lower min & max energy setting.

See this answer for a more detailed description:

Particle Emitter Breaks in emission. Help?