Noticed that the vacuum hose to the fuel pressure regulator was off.
I have put about 150-225 miles on it this way. (Haven't had it that long)
Replaced it with new hose. Cleaned MAF and changed air filter. Prior to this the idle in gear was fine, 700-800ish. Since then, about a week and 100 miles, it has been low, 500-600ish and an occasional stall at a stop.

Clean the IAC and wait for a remapping on the ECU or something else?

 

Increase the idle speed with the throttle cable adjuster. Should be at 650 - 675.

 

Alright. I shall consult The Holy Book of Armaments. ..aka the RAVE.
It's a mechanical adjustment then?

 

Yes, mechanical, it's a thumb screw on the cable at the throttle. The throttle cable does stretch over time and since your not flooding the injectors at full pump pressure with the FPR now open it's probably a good time to take up some of the cables slack. You suggested checking the idle air solenoid which is a good decision too.

 

Thanks, I'll give it a shot.