I was tempted to do the rebuild but decided to sent it for repair because no way for me to test the internals. I sent my ETA to BBA-reman 2 weeks ago before sending it for repair i spliced the ETA harness - wire insulations were degrading. I received/installed the repaired unit last saturday, idle and driveability is ok, so far no limp mode. I'm driving the car daily since Saturday to make sure everything is OK. For $250 (ebay BBA listing includes Free Next Day shipping) - I'm a happy camper. You may want to check them out.

BBA will test your ETA if your core can be repair.

My ETA part number was 000 141 57 25 for non ASR 1994 E320 Wagon.

Hope this helps. Also, BBA listed their service as Repair / Rebuild.

Here is their ebay listing: http://cgi.ebay.com/ebaymotors/Mercedes-Throttle-Body-Actuator-Rebuild-Repair-Service-_W0QQcmdZViewItemQQhashZitem35a7bbc3caQQitemZ230447367114QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries