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Here is something completely different, I would replace the ignition switch, it could be cutting out on you. Possibly the PO had a gazillion keys on his keychain (heavy) and it has worn the switch itself. The loud band (backfire) could be caused by the ignition not sending voltage to your HEI and with your throttle in the same position would dump large amounts of raw fuel into your exhaust system. Then when it (ignition) cuts back in it ignites all that fuel and KA-BANG!!! It is just a thought, other than what was mentioned already, Doug
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