Originally posted by Y2KSVT:
Cleaned it a year ago with my last intake cleaning. I forgot to mention that this was something I hadn't done yet with the new intake rebuild. I'll give it a shot. But with everything I've done, I swear it's fixed. I'll drive it all that day, and the rpm's sit perfect at ~700rpms, no bouncing idle, and no dying. Then, the next day is when the rough idle comes back.

This scenerio happened with:

cleaning the IAC
replacing intake gaskets
putting in an EGR gasket that wasn't there.

Each time I swore it was fixed for good. The next day is when it starts to happen again. Each time I've reset the battery.

Mark



Pull the battery cable and kill the long term memory in the pcm.
This will force the pcm to relearn everything. It could be that as the pcm is learning it starts to develop issues.
If the car runs and idles good at first after the battery reset, then gets bad over time, you probably have to set a few things related to engine displacement and commanded A/F.

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black