[kdjones2000]

It works fine without the A/C engaged, going to ~1200, then dropping. It consistently works fine with "normal" workloads.

With A/C engaged, sometimes it will go to ~1200 and then drop to idle just fine. Other times it goes through that, down to ~700, then back up to normal idle and stays there. Other times it will go down to ~500, stumble and recover to normal idle. And other times, it will go to ~500, and stall.

I have been playing with this now for about 2 weeks, trying to figure out if it's when the engine is cold, warming up, or hot. Happens in all situations. Doesn't even seem to be related to ambient temps. Of course my range of temperatures is limited here, with lows in the high 70's and highs in the mid 100's.

I have a friend with an S2; is that the same AFM as on the S? Looks to be based upon PET. I know that the injectors are the same.

This car is supposed to be a starter car for my kid, so random stalling is not an option, as it will lead to loss of power brakes and steering.

Just frustrating as heck.

I am about to go through the entire 944S DME test plan at the DME connector, to see if there's anything that I am missing.

Spencer, yes, TPS was checked out and works properly, both idle and WOT. Idle contact is reached every time the throttle is released, so it's not sticking. AFM is smooth throughout its range, although I haven't voltage tested it yet. Factory plugs are in all adjustment points on this engine still.