I have a 2012 Wee (E33-Calif. model)that needs the 600 m. service. I prefer to do this service myself, and am wondering if anyone has had a problem with the TB's needing synchronization. The TB synch is required at the 600 mile dealer service on an E-33. My idle is constant at about 1200rpm with no discernable hick-ups or surging upon acceleration, so I'm assuming the TB to be within spec. as well as the TPS. Any other symptoms I should be looking for that would necessitate doing the sync?