Cold Engine Stumble

[seanmcr6]

I've been having this issue for just over 2 months now.

When the engine is cold, it starts and then about 2 seconds later it starts to stumble. The rpms drop to 500 and then after a couple of seconds the engine increases it's revs to about 1200. It will stay there for about a minute and then settle down to a regular 750-800 rpm.

Here's a vid:

http://vimeo.com/v3rnica/coldstumble

EDIT: I don't know why this vid doesn't show up...if you click on View on Vimeo, it plays just fine...

Here's another, shorter, vid:

http://www.vimeo.com/25356604

This does not happen when the engine is even the slightest bit warm.

I've unplugged the MAF, still happens.

Cleaned and checked the TB. Still happens, every looked ok inside TB.

New air filter...air filter box inspection. All ok.

It's been suggested that there might be a bad temp sensor, I have a durametric, but I'm unsure which temp sensor to record during startup to try and find fault.

I do notice the SAP seems to whine quite loudly at startup....but frankly, it's always done that since I bought the car last year, but I never had this engine stumble.

Any suggestions for thing to look for before I haul this thing to the dealer? (again)

Thanks

sean

Edited July 5, 2011 by seanmcr6