Keeps coming on at 1/2 tank fuel. New plugs, new o2 sensors, new spark wires, rotor and distributor cap. Keeps getting misfire codes, been fueling at BP,Shell, Costu premi unleaded gas weekly, added Techron fuel injector cleaner, HEET. WHAT THE HELL. Car has new fuel filter and pump
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4.3L V/6 - - possible fuel spider (fuel injectors) failing - this lbs locates under the upper intake manifold.
Fuel pressure leak down test will confirm.