1990 Celica ST Acceleration Issues when cold

[matt488]

My '90 Celica ST (4AFE) will not accelerate when it is cold without hesitation. Even flooring the pedal does nothing, it just hangs there. Pressing the gas pedal a few times sometime overcomes the problem. It was hanging at about 3000 RPM and will surge to around 4000 and shift. When it warms up and the coolant gauge is a little under midway (where it stays when warm) it runs well. I have read some other comments about a MAP sensor problem, my Haynes manual describes something as a "Vacuum sensor" which seems to have a similar description. Any information will be appreciated. Thanks.