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my 08 duramax recently started to stumble periodically while cruising at highway speeds, usually while the engine isnt working very hard. is sorta hiccups and i hear a quick turbo fart with a brief loss off a power and returns back to normal instantly.
i havent had any luck trying to search this problem. I changed the fuel filter, there are no codes or engine light on. and it never has any issues while your foot is in er. just on cruise control or cruising.