Ok, so I've been having this recurring issue, that is starting to become a REALLY expensive habit.

I'm running a boosted B18C on a P30, OBD1.

About 2 years back I installed a brand new distributor. OEM.
After about a year and a half I was experiencing intermittent stuttering, and most of the typical dizzy module issues....until one night it wouldn't rev anymore.

Not being able to wait for replacements, I simply bought an OBD2 type-R distributor (about 2 yrs old) and re-pinned it.

Problem solved. Been running fine for a year. Mind you, I only dive a few thousand miles a year with this car.

2 days ago I noticed a slight hesitation around 6K rpm. Quickly ruled out boost issues, because it would boost fine right up till that point.

Last night I went to pick up a friend, and at around 4K the car hesitated violently, and a second later would rev on as if nothing happened.
Feeling uncomfortable I turned around to go home, but a few hundred yards the car just shut off.
I tried to start for several minutes until it started again. Ran fine. But a block down it shut off again. Needed help to get it to start with jumper cables by that time. (small battery, relocated to the back too)

It seemed to run fine the few blocks home.

Now it seems like I blew my third module in just a few years. Which is more than a coincidence to me.
I've had comments about my grounds being on the thin side. But didn't bother replacing them as long as the car ran fine.

What can be the possible causes for blowing these out?

 

Can't comment on your earths, but I do know that HT leads that have developed high resistance (i.e. old leads) cause the ignitor to run hot, and this kills the ignitor. I blew two ignitors in fairly quick succession on my Accord before I found this out. I'd have the lead resistance checked.