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one of your problems could be in the injectors they maybe putting to much fuel.

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Q: Your 1994 Chevy S10 Blazer 4.3 V6 Vortex is running rough on take off it spits and sputters and a poof of black smoke comes out of the exhaust what could be wrong?
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Can you please tell you the changes that would have to be made to switch a vortex 4.3L motor from a 1995 Blazer S-10 to a 1997 Blazer S-10 that had a vortex 4.3L motor. They are both 4-wheel drive.?

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