our 1990 mitsubishi eclipse turbo dies for no reason. Sometimes when at idle sitting still, under boost,deceleration,steady highway speed. When it quits the fuel pump does not run and I have no spark at the plugs. The only consistant thing is that every time it quits, the boost gauge drops to the bottom of the scale, not zero, but the bottom of the scale on the gauge face. If you turn the key on and the boost gauge goes to zero the car will start and run fine,but if you turn on the key and the gauge stays at the bottom, no spark or fuel pressure. Any ideas ?