Thank you everyone. I replaced the intake manifold gaskets, throttle body gasket, egr valve gasket, and egr return gasket. Vacuum now holds steady instead of fluctuating radically. She's running like her old self.
Sorry for the slow response - I had a work project consume all my free time.
I tried to check for a vacuum leak using propane and listening for a change in idle, but could not detect a change. I'm going to try again while monitoring short term fuel trim to look for a reaction, but it may be a...
No codes.
I have put it in neutral while slowing and it didn't make a difference, so I don't think it's the transmission.
I'll see if I can capture the metrics on fuel and o2 sensors. I have not checked for vacuum leaks.
'01 Tahoe with 213K miles. Dies when slowing to a stop, but only while the engine is warming up.
At cold start, the engine is fine and I can drive out of my neighborhood (stopping at 3 different stop signs along the way). Then I can make it half a mile down the street where it will die when I...
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