i recently bought an 84 GN. It runs pretty damn good. But when i get on it and the dummy lights come on she doesnt have the umph i think it should. Leak somewhere? boost too low?
You should start by getting a boost guage at the very least. The second idiot light comes on at only 7psi on my dad's car. A scan tool is highly recommended so you know all sensors are working and 02 volts are within the right range.