replace the crank sensor..it will eventually not crank and run...60$ at auto zone and check all grounds, back of the fire wall to motor from trans to chassis and ground(add one) from ECM to chassis..could be in any of the weather pak connectors but the sensor seems to be the one the only other one is the cam sensor(in the distributor) if you have changed cap and rotor you may have damaged it or its not sitting straight in the notch on the distributor base
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