Do you actually have the DTC P0607? If not, a dirty, restrictive, fuel filter could be causing slow acceleration.
Have you read the TSB EG042R-07? Does it say to make sure that all the electrical connectors which feed to the engine computer are making good connections? Good connections can, often, be achieved by disconnecting the electrical connectors and reconnecting them. This has a wiping action on the terminals and may restore a poor connection, terminal to terminal.