1986 chevy blazer with 305

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I seem to be having an electrical problem with my blazer. So far I replaced the ignition module, pick up coil, ignition coil, new rotor. It seems it may be getting to much current. I drive about 3 miles and it will just shut off. When it shuts down I check for spark and there is none. What else could it be? The electronic spark control module behind the glove box maybe? Hope some one can help! Thanks