I finally made a video of my tC's re-occurring low idle/stalling problem. Today I unplugged the battery to install a steering wheel. The low idle (see video below) occurred after I reconnected the battery and started the car. This problem happens every now and then, but goes away if I don't drive the car for several hours. I can make the problem appear if I cold start my car (hasn't been driven for several hours), then turn off the engine before it warms up. If it restart it within a few minutes, the low idle problem occurs. This problem happens 2-3 times a year, but goes away the next day. It started happening when the car had about 30K miles. Your thoughts? I searched, but no one seems to have found a definite solution.

Video I made today of the problem. The engine dies on its own near the end of the video.

About my car:
Purchased new in June 2005
74K miles
manual trans
Engine mods: K&N drop-in/panel filter, Megan S pipe, HKS axle-back muffler
No CEL

 

Have you tried cleaning your maf sensor? Also try cleaning the throttle body as well. Usually when you disconnect the battery on the tc, the ecu has to readjust so it will idle that low, ever since I cleaned my throttle body, every time I re set the ecu, it will go right back to where it was...

Cliff's
Clean MAF
Clean Throttle Body

 

This happened to me the other day, took it to Toyota and they fixed it for free. The air intake wasn't completely sealed making the computer do that to it.