Im still working on my tune but im getting some studdering in rpm, I feel like it might be spark blow out but not sure. Seems to really only happen at about 3k to 4.5k rpm....see datalog below....critique, criticize, recommend away...i did end up bringing my afr a bit richer, need to upload new datalog.

 

Get your car running under 12 AFR in boost and I suspect it will go away. You should be aiming way richer at least for now, for safety and stuff.

 

Ok ill give that a try tonight and ill make a new log. What about AFR right before positive boost pressure? In theory, there is still boost there bringing the car out of vacuum, just not positive pressure correct?

 

If you are talking about your AFR Target at 100 kPA, try for around 12.5 - 13.0 for now as mega squirt will interpolate between that row and the next positive pressure row and those values at low boost should be relatively safe.

 

Well, richened it up and pulled timing got most of the studder out...but was actually still studdering a bit. Ends up, it was my spark plugs. I didn't realize that a non-resister plug would put out too much noise and disrupt the megasquirt. Swapped out to resister type and I got a solid running car again! Going to add some timing back and see how we do. Thanks for the help!