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  1. 911 Problems Forum
    I was working on our lly duramax today. I’m having issues with a rough idle among other things. It idles like crap and doesn’t rev past 1500. It has a little blue smoke, I pulled the plug on the ignition switch to try to figure out a range shift inhibited code, and it started to run fine, but it...
    duramax lly low rev rough idle
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