Mick402

I got one of these. and it works great. It turns off the cylinder deactivation. https://www.edgeproducts.com/products/in-line_chips_and_modules/pulsar/pulsar_lt/parts/22451 The truck runs better, no more auto shut off and I think I picked up some mileage.

I had the same thing on my 2021 6.2 RST. I got word back from the dealership. Bad lifters a bent pushrods.

I just had the same thing happen to my 21 Silverado RST 6.2. it was running so bad I had it towed to the dealer.