Hello.  I understand that the computer is in what is called open loop for
about 2 minutes when first started. After 2 minutes, it goes into closed
loop. Sounds like a problem that is in a sensor that is only providing
imput to the computer , in closed loop.Maybe this sensor is bad,and without
it, the engine wont run. .Could be one of several. Not sure which. Maybe
ECU ,AFM, Temp 2,or others.You say this happened when comming out of moth
balls? Maybe a wire chewed by a mouse? Try wiggeling all the connections.
Even disconnectiong them , and reconnecting them.Will it rev ok in the
first 2 minutes?