'17 2500 fully deleted (including heater grid) w/ 18k miles, tunes by Ray/MM3. Have driven it for nearly 6k miles without any real issues. Just recently it started surging at idle. Not all the time, hot or cold, no CEL's. Just enough to be annoying. Otherwise it runs great throughout the power band, under load and all gears. Any of you fine Cummins gurus have any thoughts/suggestions?
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