This may seem like a odd question, or request, but theres something I would like for my engine to do. I am not really sure if this is even possiable with the 7427 or not, but I figured I would ask.
This all goes back to my early days when I still had tbi and a 7747. When I would start the engine with the old 7747, the engine would rev up as soon as it fired and then dropped down to idle. I think some call this "flare up" when the engine starts. I actually loved that, as my exhaust sounds good when doing it, it caught peoples attention and helped the engine crank on up. You crank engine, VROOM, then idle.
Ever since I swapped to the 7427, it no longer does this. It just kinda starts, just goes from dead to idle, no vroom or anything. I remember reading that thread on here about the iac logic in the 7747 and it said to reduce the flare up, to lower the iac park position. I searched around on the 7427 and found that and tried to change it, raised it a little, but it made no diffrence, so I set it back. I noticed that when I turned on the key, didnt start the engine, connected tunerpro, it would hold a low number of iac counts. like it ignores the iac park position and sets itself at something diffrent. I found one parameter that was something like "iac added airflow after startup" I have raised this some and it has kinda worked, but its odd, it doesnt do it every time. Most of the time it doesnt do any diffrent, then other random times it will start then the momentairy vroom then idle. I'm just not getting the results I am looking for.
With so many more idle and iac parameters in the 7427, I am wondering if what I am wanting is even possiable. Seems I remember reading the reason the 7747 did it, was the iac parked open, and did not move untill the engine started. So basicly it would hold wide open, engine would start, then the momentairy vromm was simply the ammount of time it took the iac to close.
I am running BMHK, 454, 0E, manual trans bin. I tried (just out of curiosity) a 350, 0D, auto bin (since their are no 350 7427 man trans bins) and startup and idle was pretty much the same (I did find some interesting results with PE, but thats another thread)

So, is there any parameter, or set of parameters I can change to get the result I am looking for?