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Sounds like the fuel filter which is easy to change. The next step would be the fuel pump in the tank. If fuel pressure is low from a clogged filter, the throttle plate will open and not get enough fuel so it would be a very lean condition whci would cause popping and lack of power. This happened to me in a 30 ft RV running a 460 Ford engine.

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Q: 2000 Chevy Express van 5.7L engine pops lacks power sometimes?
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