You need to have the unit programmed to sense rpm and hook up the sense wire to an AC source like a neg. coil wire or if DIS then the neg wire on an injector. The module needs to know the car is running.
If you want more info post what kind of unit you have and how you have it hooked up.
pech i had a similar problem when i 1st got my RS installed at bust buy that f tards screwed up my wiring harness so bad but to make a long story short make sure the ground is good that was the problem with mine