My IS250 occasionally shudders when I'm stopped at a light, and it does it every now and then on acceleration. It almost feels like the car is stalling, as if I lifted up the clutch pedal just a bit too much, but it picks right back up without stalling. Any ideas what's causing this?

 

I think this is the carbon buildup issue. Search the forums for the thread.

 

Try searching before posting. This is the carbon build-up issue, covered by 70k powertrain warranty: https://www.clublexus.com/forums/is-...d-threads.html