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Have code p0449 that appears twice when scanned

(2006 Chevrolet Trailblazer)
in Shelby, MT on August 22, 2014
my 2006 chevy trailblazer keeps idleling and the reduced engine light appears and check engine light and traction light appears changed 125fuse, all fuses ,AMF, throttle body, fuel filter sensor, pedal sensor still idling rough but runs fine sometimes want to be sure that is the problem
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