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  1. Random miss off idle/up, unplug MAP runs fine ?? 2000 S10 4.3L Vortec

    262ci Forum (4.3)
    Truck has 75k on it, new fuel pump 55psi @ idle, MAP @ idle 10.3 (19 inches of vacuum). Tight Distributor shaft, newer cap, rotor wires, fresh plugs, filters, cleaned MAF ... runs like crap at anything above idle but is smooth when accelerating. If i unplug the MAP she runs/drives fine sept a...
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