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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

noob chevy owner looking for help

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Old January 29th, 2012 | 10:34 PM
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rubinscube's Avatar
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Question noob chevy owner looking for help

2003 suburban 1500 flex 5.3 running 89 gas in colorado. Replaced all 4 o2, cleaned mass air,cleaned throttle body, iridium plugs, new wires-still idles rough cold until 15+ min warm up to normal temp.any suggestions greatly appreciated.
Old January 30th, 2012 | 12:01 AM
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nj85z28's Avatar
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From: Vernon, NJ
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Faulty EGR is possible here.

Part 1 -How to Test the GM EGR Valve (P0401, P0403, P0404, P0405, P1404, P1406).
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