You only have a probe for pyro. Boost is an air line. Check your air line and electrical connections. I have bad probe wires from auto meter. First 2 were junk….gave up on it for a few years. Contacted them about it again and they shipped me another new one at no charge. They said they had a bad...
Looking for a good shop near Lodi, California. My cousin lives there and his LB7 isn't running good. He has a mechanic who they usually use looking at it now but it doesn't sound like he knows a lot about the Duramax.
Ricks suggestion should help. Made a video of it. If not familiar with the audio you probably won't find the humor in it. Sorry its vertical too. :o
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Best bet is to have the dealer scan it or find someone nearby with some EFI Live software. Many of the cheap scanners you'd buy at the auto parts store don't go deep enough.