^^^ Hey, man, I'm gonna go out on a limb and say the throttle circuits on your ECU are on their way out. When she's in limp mode, try stomping the hell out of the gas pedal and see if that wakes her up. If not, try a restart and stomp it again. Do this maybe 3-5 times and see if it shakes the limp mode off.
Long story short, the spec stranded us in vegas throwing the same codes IIRC. Thought it was the TB, so i had a buddy drive us home (to cali) and back for my spare TB. Didn't do it. Out of sheer frustration (driving 8 hrs and still 500miles from home at 3am) I cursed and stomped the living sh*t out of the pedal. Viola, it would wake back up for a few miles, then I'd have to do a rolling restart THE WHOLE WAY HOME. Eventually it got worse and worse, to where I'd have to rolling restart a few times before she'd wake up.
Previously, the day before I had been hauling @$$ from Reno to LV, doing 120ish in 105' temps. I'm thinking that f*cked with the alty, which in turn fried whatever circuits on the ECU that controlled throttle. I changed the TB, MAF, and gas pedal, no dice. It wasn't until I sourced a junkyard ecu (5L non-nats btw) and bam, up and running again.
FWIW, I've been there, it sucks, and I feel your pain.