ThomasElkins

I recently purchased a 2020 Sierra Crew Cab SLT 4x4. After about a week, I started noticing a slight shudder when at cruising speeds. Pretty much any time above 40 mph and not accelerating. I first thought it was a transmission problem, but took it to the dealer and try said there’s nothing wrong with it, nor could they feel anything unusual. I really don’t know what it is, but am leaning more toward a problem with the automatic fuel management system as the engine reduces to fewer cylinders. It is really subtle, but annoying. The engine is a 5.3L and transmission is 10 speed. Anyone else experience this? Is this really normal as the GMC tech claims?