I was driving down the road and it just shut off. I have a 4.3 v6 Vortec and it has no spark, i have changed the Disturber, ignition control module, plugs and wires and cam position censer. Is there anything eles i need to look at.

 

Could be the ignition switch. Is it worn/loose?

 

it works just fine

 

It may work fine physically, but not electrically.
Make sure you have power going to the coil, and always check ALL the fuses first.

 

Check your crank sensor and the wiring going to it.