It's funny how you say that, but I have been all over this site NicoClub, 240sxFourms and several others. None of the above have listed an explanation for this problem. Most responses say "Vac Leak" check for Vac Leak Vac Leak Vac Leak
![smash](../../icandy.zilvia.net/img/smilies/bash.gif)
. If I find out why mine is doing its idle problem I will let you know. I think that it's the MAF because I have been all through my engine bay in the past month with a new engine and other random things (IACV, TPS, AAC, Coolant Temp Sensor, and Checked all Injectors for resistance and spray pattern
![Axe](../../icandy.zilvia.net/img/smilies/dark.gif)
) and when I dropped my new KA in I made sure to replace all hoses that were brittle or cracked. Thus I think that my MAF is the last thing other than pcv, and I really don't think that the pcv would be making my idle do this crap. Like I said if I find out that it is the MAF I will let you know. BTW your ecu is probably the reason that your idle drops too slowly. When I swapped my ECU it changed that problem.