Another MS conversion, Progress, at last. Options

[JimN73]

I've been talking to McMark for some time about the MS/ignition upgrade. I decided to to take the plunge a few weeks ago and asked Mark to put it on his schedule.

Jeff (JSConst) had bought a kit from Mark and decided not to use it, so I bought it from him. All of the pieces are together and Mark has time starting on Sunday.

Unfortunately, my time is limited so I may not participate much. I will add updates as I learn of them, or Mark may do that if he has the time.

[JimN73]

Little has changed.

Mark built a fully shielded harness and installed it a week or so ago. Although it, generally, runs better, bucking remains an issue at a little over 2000 rpm.

There is a new issue, or one that just became evident when other things were cleaned up. The car runs rough when first started and then, a couple of minutes later, rpms drop to almost 0, the AFR spikes to 19. I realize that the AFR is an effect not a cause, but can't tell what the cause is.

Mark also put in a cold start/idle control gizmo. So the car starts better, but not really good.

Here is a link to the current tune and to a datalog done this morning on a cold engine.

Mark thinks this is because of the cam and/or lightened flywheel, but before I junk the MS or start to depower the engine, I'd like to get second opinions or options.

https://www.dropbox.com/sh/p593bw6iyebgwjn/bANp3X25ic

Any suggestions appreciated.