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Fuel pump is your issue, 99.5% sure of it since I have seen this happen to my Tahoe before. Some are noisy when you turn the ignition on and some are not and some will just shut off while driving along with the hard to start issue but I've gone thru 3 fuel pumps on my Tahoe and helped put on a couple on my dads older '98 Silverado. I'm just shy of 300,000 miles on my '01 Tahoe and she is still kicking along just fine with just a 1/2 quart of oil consumption in between oil changes.
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Swift....Silent....Deadly

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