Im having problems with my turbo
 

i have a toyota supra 1987 7mgte.i having problems with ma turbo my car is not running the way its suppose too.when its making boost more than 5lbs the computer wants to turn off my car.everytime i stop the car and start moving again the car has like no strength to move and starts to make boost at 2 rpm in 1st gear and thats in every gear.Can anyone tell me whats wrong with ma car??????