95 s10 blazer no spark

95 vin w 4.3 no spark. looking for test procedures to diagnose the problem without throwing parts at it. I want to fix this not waste money. thanks for advice!

No spark at all on any plugs? Distributor? Are you getting voltage at your coil and distributor?
I'm not sure what ignition system you have on your 95 but here's some more help>> http://aa1car.com/library/no_spark.htm

and here>> http://www.aa1car.com/ignition.htm

I have voltage at coil, distributor and module. plug wires come out the side of cap.

And you're saying you are not getting any spark coming off ANY of your distributor towers?

I use a inline spark tester like this > http://www.amazon.com/Mountain-8709-Line-Spark-Tester/dp/B000JFNACG
to check for spark. The Tester can be hooked up at the spark plug or the distributor towers but you can just unplug the ignition wire at the distributor and hold the wire with a cloths pin close to the tower and a spark should jump when starting the car.
If no spark jumps you have a problem with your distributor.

make sure you hold the ignition wire with a cloths pin so you don't get zapped.
You might want to slide a nail inside the ignition wire boot so your gap isn't too far to jump.

I assume you've already removed the distributor cap and looked for wear and corrosion on the inside cap terminals and wear on the rotor too right?

Does the rotor spin when the engine is cranked?