Mechanics

CHEVY RUFF IDLE

2003 Chevrolet Silverado

Engine Performance problem
2003 Chevy Silverado V8 Four Wheel Drive Automatic 106000 miles

03 chevy silverado. Getting an intermittent rough idle and has a mass air flow code as well as a 171 and 174 codes (lean condition) replaced the spark plugs/wires, mass air flow and fuel filter. Also tested the fuel pressure and came out ok, but still getting the rough idle. Runs great at any speed besides idle. Any thoughts?
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Ruff_runner03
February 26, 2010.



The lean mixtures usually indicate a vacuum leak. Have you checked for leaks?