stuck in 3rd...tcu issue? help

[dsm2die4]

So here's the deal:

Got a steal of a deal on a 91 tsi. Put a new water pump, tstat, t belt, and fluids in. Runs great now, IT JUST WON'T SHIFT OUT OF 3RD GEAR. It goes into park and reverse kinda hard, but in drive its really hard to start out and then it won't shift up or down at all with changes in speed.

I checked the transmission fuse and it's fine. I thought I ran a TCU diagnosis scan and got 14 which is for a TPS. Adjusted that, still nothing.
Any ideas on what to do?

Where can I find the TCU?
Anybody have another one I could try out to see if it works?
HELP!

thanks