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Because a true 350 vortec I think relies on the vortec intake in order for the pressure to stay correct. I just remember i had my vortec box off of my truck one time I started it and It died just put the old vortec air intake back on and it should be fine.

sounds like you have vacumn leaks around the intake manifold, this can be checked with a can of carb spray,

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14y ago
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Q: You put a 350 vortec out of a Tahoe in your 91 silverado and made it carb but it keeps dying why?
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