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Most common causes include the plug wires, distributor cap and rotor, fuel pump and fuel filter. Fuel delivery being the most likely suspect since it is not happening across the rpm band.

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Q: What would make 96 s-10 blazer chug at around 40 to 50 mph you have changed all the plugs twice replaced the o2 sensor and cat converter checked the maf and the egr valve the check engine lite isnt on?
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