I have an 1995 chevy blazer that i have replaced the crank sensor the cam sensor, the coil and the Ignition control module, I even bought a ECM out of a junk yard and tried it but I still can not get spark out of the coil there is power to the coil and the IGM but no spark all the fuses are good what else is there that could be the problem? Someone please help

 

You may want to start tracing all of the wires from those components back to the ECM. You probably have damaged wiring somewhere in the loop.

Are there any codes present?

 

The codes that were present was for the cam sensor and the knock sensor. Would the knock sensor stop spark?

 

A knock sensor code shouldn't cause there to be no spark.

 

I also have power to the coil and powere to the ECM could the ignition switch be bad?

 

I just had a no spark situation over the past weekend. Turned out the be the chinese module the PreviousOwner installed on my blazer. If I let it sit for a day or two it would crank up and run sh!tty for 5 minutes or so then die, and then it would not start back up at all. Got a actual GM module and runs better than it ever has. Did you use a halfway decent module?