Originally Posted by Phishin
2018 Silverado 3500HD with 6.0L gas motor.
I notice in the morning when I start my truck, the idle stumbles moderately. As I back up out of the driveway, it stumbles as well as I pull way down the road. It immediately goes away once I get the RPM's up and is hardly noticable once warmed up and back in park.
The truck has never had a "sewing machine" idle. It's always felt a bit "rough". The tach has a small bounce to it (tiny), but you can feel it in the seat.... Even when fully warmed up.
Any ideas??
If they can't locate the problem and it bugs you every day, trade the vehicle or sell it.
I once had a new early 70s Ford Econo Van that had loose steering that drifted, direction depended on road slant. Never got fixed despite complaints by me. By the time it was a year old, I got fed up and traded-it-in.
Never bought another Ford again. My first car-ever, in 1969, was a Ford. That was a bad decision purchase. Me and Fords don't get along.
I unfortunately had the same issue with a used 2012 GMC SLT that I bought that was a "certified" vehicle at the GMC Dealer. It had a 5.3. Sometimes it would idle like a lumber truck. Chased the problem for almost a year with no results. The only up side is when I traded it in on the new 2018 Silverado they gave me $5,000.00 less than what I paid-in short it cost me the same amount as a lease would have. BTW-it's not normal.
I agree...if you can afford to do so...dump it. This is a issue that is very, very difficult to diagnose and repair.