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possible distributor shaft bearing worn, while apart check everything, bushings,gear,etc.
below are a couple links you should look at, they had same problem. press the helpful button
Chevrolet Blazer 4 3 Misfire Under Light Load 2000 2500 RPM
97 Jimmy 4 3 Misfire Under Slight Load Gen III and IV Small Block...
GMC Chevy 4 3L random misfire bad distributor
GMC Sierra C1500 4 3L Vortec cylinder 5 misfiring GM Forum Buick Cadillac...
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