CAEmitterLayer emits random unwanted particles on touch events

I know this is an old post, but I also had this problem.
Jackslash answers it well in this post:
iOS 7 CAEmitterLayer spawning particles inappropriately

You need to set beginTime on your emitter layer to begin at the current time with CACurrentMediaTime(). It seems the problem we have occurs because the emitter started already in the past.

emitter.beginTime = CACurrentMediaTime();