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Re: 1998 tahoe 5.7 vortec slow or no start when hot...
Corrosion can be hiding under the sheathing of the Batt cables where you wont see it. A resistance test will not show this. So I would suggest you replace both Pos & Neg Batt cables.
The IGN switch could also be an issue. The Crank switch is one of five separate internal switches.
Turn on the headlights when this happens again. If they go dim or out then I would suspect the Batt cables.
Welcome to the Forum and good luck.
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57 Chevy 210
65 Olds 442 Convertible (Another one sold)
75 GMC Vandura 3/4 Ton
1999 K2500 Old Body Style Suburban (Gone but not forgotten)
05 Dodge Ram 3500/5.9 Cummins
2012 Toyota FJ Cruiser
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