That IS the test to rule out the knocking exhaust, but, the spider injector is somewhere orbiting inside the USPS network on the way to being rebuilt. I won't be starting the truck anytime soon 😉
It's pulling timing under load/driving as well, but it's much more variable.
My truck is trying to install GM update N25-F163BU, my gmc app shows that is the new update file, but when I go to check for updates its greyed out, and I get the message the update cannot be installed, try when I shift to Park next time, but I've been shifting to park for a month now and the update doesn't install, my truck does stay in the garage, but has a very good connection to my home wifi. My biggest annoyance is the audio cutouts during the first few minutes of driving, my dealer keeps telling me GM is working on an update. My build number appears to be the same as yours newdude.
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