The relay that is utilized by the EC2 to disable the secondary injectors at MAP below the stage point. 

Do you have a relay external to the EC-2? 

Yes; It may be that mine is just an earlier version.

With your firewall plugs, can you swap primary and secondary injector wires.  If you can come up with a way to do that, it might help determine if you have a leaking/sticking injector, vs some sort of electronic gremlin.

As you may have noticed from my other post, I can go half way and connect the primary injectors to the secondary plug.  No joy.  The rough running could still be a “leaking” injector since it gets too rich and rough, but these injectors only have a few hours on them since cleaning and testing by RC Engineering, and their flows matched almost exactly.  I haven’t heard of leaking as a likely failure mode.

Al