Speed Density idle issues?

Mine did that a lot too.. mostly when I started it up after not running it for an hour or more. Engine temp. didn't matter. I removed my IAC and cleaned that heck out of it, and although my idle is a little bit higher now, it hasn't done the stalling thing since.

Might be something else, but never hurts to clean your IAC anyway.

Yes, speed density cars are known to have more of an idle problem than mass air cars. I think the difference is that a speed density car uses only the preprogrammed info inside the computer to tell it what to inject and when, based on general info from the throttle position, manifold vacuum, air temperature and what have you. But the mass air cars are using that info PLUS measuring how much air is actually being sucked into the motor, which gives the computer a much more accurate picture of how much fuel it needs to inject. And that difference allows it to compensate for changes in the engine, such as heads, cams, etc. That's why speed density cars fall down when you do mods on them -- they think that the car is stock, and don't have any way to tell otherwise. But you should still go down the checklist of possible problems contained in the "sticky" about surging idle issues at the top of this tech forum list. It contains a pretty comprehensive list of things that can affect your idle.

IAC or vacuum leaks are nornmally the culprits - if not that then try a new MAP sensor.

When mine was SD I found a vac leak EVERY time an idle issue would arise..check several times..i found mine just inside the passenger fenderwell..found it after the sixth time going over the whole vac system..don't give up.

Lets not forget the TPS either...