I closed up the valve cover.
Removed vacuum line from Fuel Pressure Regulator, no fuel coming thru at idle.
re-checked several vacuum lines, disconnected and re-attached to feel how snug they were. They all seem good.
Restarted car, it was rough for about 5 minutes, burned some residual oil that seeped down from cylinder # 1 plug cavity.
I cleared all codes then disconnected battery for 5 minutes.
Reconected battery, took it on the highway and now idle is smooth as glass.
Either the dislodged valve cover seal at cylinder #1 was culprit of vacuum leak or there was a leak in one of the vacuum lines that I closed.
In any case, I am now idling smooth.
Thanks to all for inputs.
(also posted on 1994 diagnostic LED trouble thread)