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The 4.3 uses a set of injectors with a metering body as all one piece that requires the upper intake plenum to be removed to access. Even then they don't really come apart to clean very well. I recommend using Sea-Foam cleaner available at most auto parts stores. Dump it in the gas tank with at least 8 gallons of fuel. Do this twice and if you still have a problem and are positive its an injector, get your wallet ready.
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Why Does 2001 Chevy 43 liter act like it runs out of gas no codes in computer have replaced fuel pump fuel pump module coil ran for a week and did it again?
You probably have a plugged fuel filter. See if you can put a fuel pressure gauge on the fuel supply line at the engine and check your fuel pressure. It could also be a fuel pressure regulator
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there isn't one.
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Code 43 is a problem in the fuel delivery system.
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