91 chevy c1500 5.7l turns over good but no spark

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1991 chevy c1500 5.7l motor turns over strong I replaced these parts already: New distributor cap and rotor, new ignition module, new spark ignition module, new spark plug, new coil, check all fuses and it's good. Still no spark from distributor or coil. I don't know what else it could be.