When you turn the key to the start position does the tach show about 200 RPMs and after you release it does the tach drop back to zero?
If not suspect in this order
Pick up coil
Ignition to ICM harness - http://www.reddevilriver.com/2.html
If your ICM is bad use thermal paste under it when replacing it.
If your ICM is bad and your ignition coil and/or plug wires are old replace them. High resistance in the plug wires break down the insulation in the ignition coil. Broken down insulation in the ignition coil fries the ICM and causes ICM failures.
If your ICM is bad and your spark plugs are old replace them. All 6, not just the back 3