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Q: rough idle at cold start on 2002 Chevrolet Tahoe

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
123,000 miles. Engine idles rough at cold start unless I increase to 1500 rpm for 1-2 minutes, then fine. Replaced plugs, wires, filters, cleaned fuel system, yet problem persists. Any suggestions?
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