Strange low power after startup

[George Selby]

I've been having an intermittent power loss with my 90 200t.  Sometimes 
when I start it up (usually when warm) it will start, but when you press 
the gas the car hardly moves.  If you press the pedal down more, the engine 
will start to stumble, and it is idling about 200 rpm lower than 
normal.  If you feather the throttle, I can get the car to move, and 
generally after 10 seconds to a minute all of a sudden the power will come 
back to normal and everything will be fine unless you turn off the car, 
then the symptoms may or may not return.

The boost gauge will read into boost when the car is exhibiting the power 
loss, so I'm pretty sure it's not the turbo; it seems to me the car isn't 
getting the proper amount of fuel.  Could my fuel pump be dying?  It 
doesn't make any abnormal noises, though.

George Selby