Well guys, I just finished replacing the fickle Perma tune ignition on my 78 SC with a superior MSD 6AL with adjustable rev limiter and plug and play simplicity. The result was amazing!!
Before this upgrade, I would have a hunting idle at cold start. It would sputter and backfire like an old grumpy witch. The minute I started the engine after installing the new ignition, and I do mean, the very first minute, the idle stayed at a steady 1100 rpm's and never fluttered or dropped. The acceleration is smooth and crisp and the throttle response is faster. I always got on the gas a little bit while going over a highway overpass on the way home and it did okay with the old system, but now the torque delivery is better and there is definitely more grunt going up the hill. the Unit was bought from ebay brand new for about $170.00 shipped. If anyone is having similar cold start issues from an otherwise well tuned, well maintained car, I would recommend trying the MSD. I am not affiliated in any way with the company. I am simply expressing how pleased I am with their product. I am still running the stock Bosch coil so my next add on will be the MSD coil. I will be adding one to my classic Mini as well.
Good luck and motor on!
Norm