Tahoe & SuburbanThe power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.
Platform: GMT 400, 800, 900
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To the best of my knowledge the evap system witch is an emissions system should not affect drive ability, at least not in the sense of a miss or rough idle, the EGR which is also emissions could cause a rough idle.
With that many miles I would suspect fuel delivery / ignition
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