UrQ Bad Bad Idle

["ANDREW FINNEY" <DFINNEY@classic.msn.com>]

I decided to try and solve my strange 1983 UrQ idle problem this weekend, 
while poking around with my new JC Whitney fuel pressure gauge for CIS. Here's 
what I found, and please let me know if there is anything abnormal. 

My Cold Control pressure is perfect, so is the hot control pressure.
My system pressure is 90 psi. Doesn't this seem high? When I turn the gauge to 
read system pressure (i.e. closed, no pressure regulator return) the car runs 
really poorly and almost stalls.
As soon as the car goes open loop the rough idle starts and will stall the car 
unless revved. Hot idle is perfect,
The rough idle will also happen upon hot start-up. When hot the duty cycle 
goes straight to a constant 50%. Then after 1 min it goes to constant 90%, 
then back to constant 50%, then to constant 90%, then it goes into open loop 
about 65% with fluctuation.  The bad idle occurs at the constant 50%. It idles 
very well at the 90% stages. Anyone have a thoughts?

New items: 

CP regulator
Fuel pump
Injectors
Cold Start Injector
Pressure Accumulator
Filters
All new hoses, vacuum and pressure
Tuned to spec w/ appropriate hoses disconnected and plugged
Runs well just has a bad idle period in its warm up cycle regardless of 
whether the motor is hot or stone cold.

Thanks for any suggestions and it was great to meet a bunch of you at Mt. 
Washington.

Andrew Finney
1983 UrQ.