Had the same issues with the "chrome" box on the Mirada long ago. Even moved the ecu to the front of the rad support where it would get airflow around it....it would still act up on occasion. Switched to MSD 6AL and Pro Billet distributer and never looked back. The distrib was still a tight fit with the stage VI heads and MP valve covers. Had to trim a bit, but from what I've gathered....the old boat is still running. I liked the MSD distributer. Pop off the cap and rotor and it was easily adjusted with the supplied springs and offset spacers.