Okay, so that didn't go so well..

Installed a 74mm throttle body at the same time as the intake (acquired TB from same party as intake) and I'm guessing it was bad. Had the TB and CAI installed and when I started the car it would sputter, revs would jump around and eventually shut off.

At first I thought it was the breather hose, since there was a bit of a kink in it, but straightening that out didn't seem to resolve the issue. Then, I thought it might be the MAF sensor, but unplugging that basically shut the engine off right away.

Left the battery unplugged for about 10-15 minutes and the same thing happened. Revved a bit, sputtered, and eventually shut off.

Put the old TB back on and the stock TB 'elbow' assembly and everything seems to be fine. Scared me that I messed my car up :\. Can't test-drive it with all this frickin' snow!

Any ideas on what was going on, other than maybe a bunk TB?