I had a 2006 Lexus GS 300 that was jerking on downshift and upshift. Took it to a transmission shop, and the dealer, both said it needed a new ECM module and a new transmission. The funny thing is Lexus didn't even look at their own technical bulletins. EP auto was fantastic! They found the technical bulletin indicating the ECM was the issue. They installed and reprogrammed a new ECM and the car is good to go! If I would have listened to the transmission shop, or the dealer, I would've spent 6k on a new transmission unnecessarily! So glad I found these guys!