Surging

[Andrew#15]

I have a 2014 Silverado high country. Under a light load it seems to be surging, I took to dealer today and they told me it wasn’t showing a code but it was probably the catalytic converter. Opinions??

[Colossus]

While most repair facilities now a days will say "can't help ya if there is no code" when it comes to things like this, every now and then you get lucky and find a mechanic who's got a talent in diagnosing.  Try another dealership if it's under warranty, otherwise do your research and find an independent repair facility that specializes in modern computer controlled engines.