Car is dying on decel - around 3k rpm

[WagDatto]

I posted this in my build thread as well. I looked, but couldn't find an answer. Two nights ago, under deceleration, the 'Goon bogged down and died. Okay, no big deal, just a fluke? It happened a few times that night, I figured it was just the idle being adjusted a little wrong. Unfortunately, the next day (yesterday) it was the same story, as well as today...

With my car, I have the IACV blocked off, and I'm using the TPS (adjuster screw) to set my idle. I've had no issues before now. One thing I did find out is that the IACV came unplugged (shitty vacuum plug) and I thought that was the culprit. My thinking was that I was letting too much air in (through the TB and IACV) and it was causing me to run much too lean and die on decel toward idle. However, I sealed it using actual heater hose, and I still had the same issue.

1st, 2nd or 3rd gear, as soon as I decel to around 3k rpm (guesstimation, I don't have a tach) it starts to bog. Sometimes it will die, sometimes it will sputter and finally catch idle and be okay to go. KCNDizzle suggested MAF plug/wiring, as the MAF is the usual suspect for any problems around 3k rpm. I will check them tomorrow when it's light outside, and make sure everything is plugged in and secure, and there are no effed up wires.

Anybody have any other suggestions?