Get a Megasquirt, You will love it, They said Options

[RickS]

Ok had a Megasquirt system installed on the 3.0. Much better throttle response and looks oh so sexy. Tuning was something else but it runs pretty well. Two issues:
1. After a cold start, the car is not drivable for at least two minutes, until it warms up. If you try to drive it cold it just stalls. Is this normal behavior?
2. The throttle is a tad touchy. Unless you slowly squeeze the throttle accelerating is like an on/off switch, with a millisecond of hesitation and then off we go. Is that normal or can that be tuned out?

[BeatNavy]

So I'm hardly and expert (been running it on a 2.3 for about 4 weeks now), but I do grapple with the cold start idling issues. I've got no issues with throttle response, however.

So I wouldn't think it's a Megasquirt issue, because that's got so much flexibility in tuning. Your issue is either the tune and/or the components used in the build aren't sized or configured properly. Ben's right - you have a lot of capability to enrichen during start and warm up as needed. You probably knew that, but it takes a fair amount of time to fiddle with it as you only get one "real" cold start per day to test changes.

In my cold idling issue I'm thinking the IAC may just not be big enough to let in the air this engine wants when cold even when fully open. I believe it's a Kia IAC, and at some point I may look for something bigger if I can't get figure it out through tuning.