I had some problems when I first install my MSD system on my Mr2. It turned out to need a special ignition module convertor($15) to work with my car. So I put one in and go on my way. Then I shut the car off and it wont start...turns out my MSD was alittle too close to the engine and the heat would affect it. So I move it and only get the wont start problem occassionally. It turns out I had the wrong ignition module convertor (or whatever the thing is) and it would mess with my FI signals replaced that and havent touched it in years runs great.