94 C4 no spark

I am having a problem with my 94 C4 LT1, I checked for spark and have none what should I check next? Will appreciate any help.

Check to see if the coil works.

its probably the opti spark.the coils rarely ever go bad.from experience with my buick lt1,had same problem,changed coil,no help.opti spark fixed it.ck a gm mech and he will give you the same advice.

Thanks for the advice,men. I changed the Opti Spark, the old one was badly corroded. Still no spark, though. Had the ICM tested at a local parts store, it checked bad. Can't wait to get it together, believe it will run now.

How did you make out with this? Did you get it running?  What was the cause?

Did you try looking at any stored codes thru the CCM (Central Control Modual)? The CCM will look at all the codes even the ECM (Engine Control Modual). On the pre OBD II you jumper between A and G on the diagnostic port connector. On OBD II there different. Maybe someone could chime in with the terminal jumper no.'s. No need to buy a scan tool. 

Oh, oh. I found it. Jumper between 4 and 12. It's called the ALDL it' s located just above the drivers knee.