As I have mentioned before my car has always had issues revving past 5k. It use to stumble at around 4500, but after replacing my cap and rotor, things progressively got better. Now I can rev her to 5000-5500 rpm.

Once I get to that point, crazy things start to happen. The tach needle runs smooth as a swiss watch normally. Idle and rpm response are great. Once it hits around 5000 rpm, the tach needle bounces around form 1000 rpm to 6000 rpm quickly. Its crazy. I think the car starts to stumble at that point as well.

Its just weird for it to act so perfectly at all other times, then do this. Any ideas fellow Z car owners...

I have checked my pertronix and it seems to be hooked up properly. I am entertaining the idea of dropping a mallory in there or a rebuilt one Nissan EI distributor.

I also have this problem after switching to the Pertronix set up. I have left it as is so far because I do not often take it out that high. But would love to know if you solve this? I would rather not go to a new distributor until I get the engine rebuilt.

I will let you know how it goes, did you leave the stock ballast in, or take it out. I have read posts where people switched coils and left out the ballast..

I left the original ballast in and I have 3 Ohm fireblaster coil. I still have to write up my pertronix swap with pics to help others after the late nights at work ends in a few week most likely. I have also read that it might be the Taco but I like the original look