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I had the same problem with my 99 2 door 4x4 Tahoe and couldn't figure it out. I had replaced the fuel pump when it went out months before. Turns out that aftermarket fuel pumps are not a good Idea. After going back to a genuine GM fuel pump, I had no more pump noise and start up is instant and purs like a kitten.

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Q: When it gets cold outside how come my 1999 Chevy Tahoe with a 5.7 vortec don't want to start It cranks for a long time before it will start and once you get it started it runs great?
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