rough idle at cold start on 2002 Chevrolet Tahoe

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?

Asked by for the 2002 Chevrolet Tahoe
Any trouble codes stored? Try some fuel injector cleaner. Check for vacuum leaks.
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