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Nothing reduces hC's like ignition retard. I had a problem with a ford once, hooked it up to a scope, had tried to lean it on the screws to no avail. watched the hC's drop from 1300 to 250 while the mech rotated the distributer. I would do whatever it takes to get through the test. pop the hood and crank back the timing before you go through. also if there is a line up do not let your engine idle for a long period of time as it will load up the exhaust system.
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