sounds like the mechanic neds to be SMACKED.
seriously, check all the plug wires and make sure they are firmly snapped to the plugs as well as the distributor cap. then you may want to check the firing order or even the adjustments on the cab. its reall hard to tell if not looking at it. also check all vacuum hoses and make sure one hasnt been pulled loose or even cracked for that matter
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2004 Silverado Crewcab
1972 Chevy Monte Carlo
2017 Chevy Tahoe
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