Santito

Well the mystery has been solved. It was found that the when the air filter was inspected at the last service, the hose was not connected to the air box correctly there was an air leak going by the mass airflow sensor. Couldn't see it from the front side of the engine.....

Email has been sent.

Yea it's been driving me nuts with no codes and we are now going on almost 3 months of it acting daily now. I have had it stall out on me a couple of times recently and the symptoms just keep getting more pronounced. Hopefully it Will throw a code or error soon!

So far the only other info I've been able to determine that this occured when the engine temp is about 185 or less and the ambient air temp is around 40 or less and the RPMs are slightly higher. Air\Fuel mixture or cold air intake issue possibly while the choke or choke mode is on??

OnStar is a sore subject... But no service with them. Got my hands on a code reader and plugged it in .... All clean and no codes and it did it as I left work for the day. It seems to definitely not happen after the engine reaches 185 degrees and up to operating temp. If it is happening and I can get the RPMs over 1,500 it clears out but once I let it get back to idle it will happen until the temp comes up. Another thing I noticed is that it typically idles at about 750. When it starts acting up and it's idling smooth it's more at 850-900.

Last time I reported it to the dealer they claimed there was no info when they scanned it.

I can't be the only one that's had this happen. Skips like it's miss firing or maybe an injector acting up. The frustrating part aside from no codes is it doesn't happen all the time even on the cold days.

Got a 2021 3.0L with just under 30k miles and recently started acting like it was misfiring or skipping while in gear and brakes on. Noticed it would happen while stopped or just starting to take off and would occur within a few miles of starting my trip and wouldn't matter if I had preheated the truck. Now, especially that the outside temp is in the single digits it's happening more. No codes, no check engine light. I had it in for an oil change and reported it then but of course the dealer couldn't reproduce the issue. Today it's been doing it more than normal and was able to get it on video... But still no codes. Once it's over 1k-1.5k RPMs it's clear and after I driver for at least 5 miles it won't do it until it cools back down. Have not found much on line about it nor other reports.. can't find anything disconnected, broken or damaged under the hood as far as vacuum lines, connections and even the air box assembly. Any other reports of this?