I had stacks of problems with mine not running well.
The bearing in the distributor was the problem!
I replaced the Crank Angle Sensor and also the Power Transistor etc etc and she still didn't run right.:cry:
In the end, what I found, was that the $6 bearing was rusted and it sent rust dust up into the the Crank Angle Sensor (CAS).
It covered the slotted stainless steel plate and the CAS so the ECCS Module was getting buggered signals. When I replaced the CAS with a newy and cleaned the plate and the guts of the Distributor every thing was ok for about 3 weeks and then the car just wouldn't run. Obviously the dust was back. It was too, I took off the dust shield in the distributor and it was covered in brown dust.:ranting:
After much heart ache it was the bearing in the distributor which I was told should be replaced when you replace the CAS. :whistling
Anyway, that might be the problem.
Mine got that way because I like a nice clean engine but clean engine means moisture, and water got up in through a buggered gasket in the Dizzy Cap and made it's way down into the distributor.:bang:
So if you have never replaced the gasket where the distributor cap sits on the lip of the Distributor housing then I'd replace that when you replace the bearing.:thumbsup:
If you have a wood vice and a bit of time then you can replace the bearing your self. What I did was bought a crapo cheap distributor off Ebay for $10 and then I practiced the strip down on the crappy one first and then I took the one out my VL.
I've never had a running problem since and mine really goes well
Err, well, it did until a bearing went in the rear of the gear box. Anyway, she's nearly all back together and I'll be on the road soon.
Best of luck and I hope the suggestions help