I posted about this issue on a couple of other Audi sites, but still have not found the solution. I have cleaned all of the electrical connectors on the tranny, cleaned the MAF, replaced the O2 sensors and the TPS, installed a new fuel filter, and cleaned the throttle body. Any other ideas; the CEL still shows a 2121 code? "During our torrential rains last week, I got some water in the car thanks to a blocked drain under the cowl that covers the wiper motors and cabin air box. I removed the blockage and dried out the car but now I have a problem where my car just looses power periodically. I will be driving along just fine, then my CEL will come on and the RPMs will drop to idle. When I step on the gas, the car will sputter but it acts like it's not getting gas. It happens both when I am driving on the highway or trolling around town. Shutting-off and restarting the car (reboot!) makes the symptoms go away for about 3 to 5 miles. The blink code shows a 2121 but that had been happening prior to the water issue. The car has 101k miles and has been well cared for. Does this sound like a legitimate TPS issue to the Audi gurus out there or might there be some other explanation?"