Dont the 4g guys have a hard time with the Delphi injectors Doug? I could be thinking of a diffent injector though. I would expect the larger the injector the more difficult to tune idle, .1 PW in either direction is a greater change obviously.
My 550's stay pretty much 13.9-14.6, they may move a bit morewhen sitting at a light but thats because i have to adjust my 46kpa bins at idle.
In regards to your getting richer Matt (this i have wanted to discuss with you just havent had a chance) I ahve noticed with mine that once it has been driven to a period of time i have a rich condition. Its in the VE table. I noticed that our cars may idle at 37kpa but after being driven may idle at 41kpa.
When i pull to a light and stop my rich condition is also at a higher KPA value. my 46kps bins are a tad high. I have been slowly dropping them down and improving. here are my lower 9 bins:
38 39 41 34 33 31 31 31 31
they were
42 41 42 34 33 31 31 31 31
This has helped me, look at yours and see where your at. I also noticed it seems a bit easier to work with the KPA values like this:
46 38 <~~~~~~1-2 above where I idle 20 600 900 1100
