"flashing" a computer just means loading a new program to it. You can "flash" the BIOS on your home computer, for example, if it's really old and you're trying to add a new hard drive that it too large for the older BIOS to recognize. When a dealer "flashes" the computer on your car, I'm guessing that all that changes are some parameters that trigger the CHECK ENGINE condition that is popping up too often. The original parameters were probably coded in a test environment, but in the real world they ended up being too unforgiving, so the "flash" widens the band(s) so the lamp is not always coming ON.
How much more was the Enclave going to cost you? I'm thinking I'll be able to buy a well-equipped Uplander (with everything except the very highest-level "fluff" options like PHAT NOISE) for around $19,000 after rebates and other discounts. I'm guessing the Acadia and Enclave would cost me at least another $3-$4k ($22-23k even after my personal rebates). Sure, the Uplander doesn't look as good, but I've never bought a vehicle based on looks (although I do have my standards ... no Azteks, for example).
I really like the look (and utility) of the Acadia over the Uplander (really no comparison), but let's face it: these so-called "Crossover" XUVs are really nothing more than lowered SUVs. And although I'm seeing more and more Acadias on the road around here, I think GM is going to lose money in the end on these vehicles (Enclave, Traverse) because they're still too big and burn too much gas. They need to size these vehicles down a bit to something somewhat larger than a mini-SUV (Equinox). The Equinox is a joke. It has the same engine as my Impala (3.4L), but less space inside and less cargo room than my Taurus wagon! It's basically a wagon on a compressed platform with an inflated pricetag!! No wonder it's being discontinued.
Why can't GM build a sexy wagon like Volvo's model? That's what I really want: A sporty sedan with more cargo space and a roof rack, but still reasonable fuel economy. I've got a family but I don't need an SUV or XUV. Most people don't. I thought with the backlash against minivans, that this sporty wagon vehicle was coming soon from GM, but they went bigger with the Acadia and Enclave. Too big for me, I think ... but we'll see. Chrysler is sort of on the right track I think with the Magnum (it can even hold a sheet of plywood in the back), but if I bought that I'd be leaving considerable discount dollars on the table.
The more I think of it, the more I think it's going to be the Uplander for $19k.