I am on my 3rd Mallory Unilite. Unilites have their data plates afixed to the side of the main body and it usually ends up on the back side after you install it.

I have found that they either work great or they don't work at all. There is no "in between" when they are missing or something. How do I know? Because I have fried 2 modules before. The very 1st one I accidently grounded the distributor when I pulled it out to shift it 1 tooth to get it in properly.

The 2nd one died in the middle of a road trip. Just quit. I talked to Mallory and they said these modules are sensitive to voltage fluctuations. So now I always put in their recommended in-line voltage filter and these systems run fantastically.

Another thing - Mallory Unilites like about 6 volts to them. The factory resistor wire is perfect. Otherwise you need a ballast resistor. They will not live long with a full 12 volts to them. And yes, the Mallory modules are pricey (about $90).

So I had my chats with the Mallory tech guys and then just followed all their advice to the letter. I swear by them now cause I never have to deal with points and their slow performance degredations.

Have you looked at any of the spark plugs? They could be old, wrong temp range, bad gaps...