I have a 1989 Supercoupe 5 speed. I recently discovered that i was leaking brake fluid from my master cylinder into the brake booster. At the time i didnt think it would cause any harm as long as i kept the fluid level up as i tried to make some money to replace it. After about 2 weeks of having fluid leak into my brake booster i began to develop an idle problem. Im guessing the brake fluid ate through the diaphragm. I am in process of replacing the brake booster and master cylinder. But i just wanted to list all my problems im having and make sure it just these parts. When the car is running it will idle arouns 500 rpm and stay there. It also is misfiring. Is the misfiring be caused by the vacuum leak from the brake booster? Or is it possible that my brake fluid that ate through the diaphragm got sucked into my intake and ate away at my seals and gaskets and ruined any spark plugs. When i check my oil i notice there is a hint of yellow fluid (possibly the brake fluid?) Im just so lost.