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rough idle-"chugging"

  1. 4.7 L V8 Specific Topics
    I recently bought an 03 which is generally in pretty good shape, but... it "chugs" at idle. it idles steady at 5-600 RPM's, and doesn't mis-fire. The cylinder balance has been checked and it's good. No check Engine Light. I've been told that it had a recent valve job. Always starts right up and...