[urq] Post overhaul issue, 83 Urq

[David Ritter]

My 83 .
Urq has been off the road for a couple of years waiting for me to replace
the head, exhaust manifold and turbo. My old exhaust manifold was cracked,
warped and leaking. The head had a couple of stud issues.
I managed to finally gather up everything I thought I would need and tore
it apart following the guide Phil Payne wrote up many years ago still found
on Audifans. The whole project really went pretty well and I only had a
couple of minor problems with reassembly.
The Water Pump, Timing Belt, Spark Plugs, Fuel Pump and Fuel filter and air
filter have all been changed. The injectors got new seals before going back
in. Most of the old gasoline was siphoned out and replaced with new
gasoline and some injector cleaner.
On cold start it seems to run perfectly normal for a few minutes, boosts
normal, idles smoothly.
Unfortunately, approaching normal operating temperature, power loss,
missing (feels initially like a fouled plugs), low idle and stalling out.
This will occur whether driven for a few minutes or just left to warm up
idling.
I've tried to go back over everything and can't figure out what got messed
up.

Does this sound familiar to any of you experts?
Thanks for listening,

Dave