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What is your question?
When I first start driving my truck and accelerating, their is a puff sound, kind of like when air brakes release the air. It doesn't run bad, just makes this sound. It does go away sometimes, but not always and it only happens when accelerating. Got a new fuel pump last fall - maybe a faulty installation???
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I'm thinking that there's a problem with the power brake booster and it makes noise when you release the brake and accelerate. I've heard weird noises from defective mufflers in the past so that's a possibility. You don't mention where you think the noise comes from, front or rear, right or left, under the hood, etc. If you can locate the noise that would be a good clue. If you want to find a specialist, here's our directory link for you: https://repairpal.com/chevrolet-repair-in-south-saint-paul-minnesota