I have a stock 07TC and I keep geting the P0606 code. I am usually able to clear it but recently I'll have to shut off the car and clear it to prevent it from comming back. I have noticed that the code pops up if the idle drops. If I keep the revs up while driving on back mountain roads its doesnt show up but if I try to drive easy and bog down the motor even a little The cosde pops up. This only started happening recently. The car is now out of warranty. Is There a TSB on this. I even tried reseating all the plugs goinginto the ECm there is NO corrosion on them at all that I can see. It seems to be accociated with the engine speed getting low.

 

I checked the other posts on this code and my situation seems to be different that the others.