[Mahler9th]

Looks like you are getting some suggestions for checking on the fuel system. Hopefully its performance can be fully verified as a cause or not.

As to spark, I think it may make sense to try NIB coil or coils, or known good used ones. It is more painful than it once was--- when I bought my first Blaster 2 replacement in 2002 they were about $25. Now more of course.

It also pays to check the wires and distributor cap. To make sure that the parts have integrity and are properly and firmly connected.

As for the distributor cap, like I may have said somewhere, a Forum poster has suggested that the has some experience with these types of caps. The current ones are apparently all made in the same place, but that might be difficult to confirm. I had one center button disintegrate from an unknown cause. It made a mess. The speculation is that a Blaster 2 coil failure wiped it out. Cannot confirm that.

I have several different caps, and they are all a little different in terms of clearances between terminals and the rotor. I don't think the distributor shaft is wobbly (it is a new distributor that JB Racing checked out 2x). So keeping an eye on my caps.

I have been through this.