What surprised me was that with the engine running at 2000, the pointer was swinging very rapidly over a range of over a pretty wide range; from about 27 to 37 psi.  It is an undamped bourdon-tube gauge, responding to a lot of pulsing.  I had no pulse filtering between the manifold and the fuel pressure regulator.

Was the engine running smoothly at 2000?  Did all the improvements you made actually allow you to run a smooth idle down around 1000 or so? 

Yes it was; so I can’t say the pulsing in the fuel pressure was interfering with the operation at lower rpm; it was, at the least, indicative of uneven MAP and likely very hard on the FP regulator.  I haven’t run lower than about 1500 yet since that is where the idle stop is set; and I am pursuing other issues. But it does now run smoothly at that speed – secondary injectors only.  The other issues are that the “staging” is not working; it does not run completely smoothly with both sets on; less smooth on primary only; and very smooth with secondary only (primary turned off).  If you can figure those things out for me, you win the cigar.  Still waiting on a new chip for the EM2, but the next time I run I’ll slow it down further.

Al