I just bought a pertonix for dad for Christmas and installed on a 79 320i which was running perfectly and now it stumbles and misses. It starts fine but won't idle evenly. I installed one on my 02 a few months ago and it worked great. Any ideas if 320i has anything diff. My 02 has mech adv dizzy the 320i vacuum. I put the points back in and the 320 ran fine again. Thanks for any help in advance. John