Changed the throttle body, now need to get it sorted out. Throttle blades are slicking in the bore. When I recentered them it seemed better until I drove it
Beyond that, I did upload the one tune that GM produced as a service update while the vehicle was still under warranty
This changes the downshift parameters on the 3>2, but strangly enough also cuts fuel across the entire fuel map, 7% in some places.
Figured I would let it deal with those changes and sort itself back to normal before I start on correcting the tuning at idle. Seems to be fairly common to add as much as 10 degrees timing off idle to get to 34*
New, other than me messing with it with sand paper and dremel. No returns now
It sits back from the gasket a ways, and I'd "think" the block of aluminum would be solid enough to not warp. At this point I'm putting the original one back on. Might disassemble it and check the shaft. Even unhooked the cruise cable thinking that was the hangup.
Might see if I can buy a replacement set of throttle plates or even a used one