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2014 WT LML, 211k, LDS 64mm, CTS2, SD cold air intake
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79 Posts
Discussion Starter · #1 ·
Evening all. So I’ve noticed something recently and it seems to be becoming more frequent. Upon start up in the morning and in park my truck rpms surge up and below a normal idle. My lights even dim with the fluctuation. This usually smoothes out after the engine is warm. In addition to this lately after getting off the highway and coming to a complete stop at a light/sign, foot on brake, it does the same thing with an up down of rpms. It’s not a significant amount, but it’s enough to hear and feel and visually see on the tach. Any ideas??

Fully deleted, EFI LIVE/5 tunes, 208k. Usually drive in third tune.
 

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2011 Silverado 2500HD Crew Cab 4x4 Z71
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9 Posts
High idle mode maybe.
 
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