Transmission Not Go Into Gear problems of the 2003 Lexus ES300

2003 Lexus Es300 with accelerator pedal, automatic transmission, and vehicle speed control issues. Consumer states that the when trying to accelerate from a low speed there is a delay before the engine responds. The consumer stated he experienced a significant abrupt downshift when slowing down from higher speeds and an abrupt upshift when accelerating from a slow speed. It felt as though the transmission could not decide what gear it should be in. The consumer was advised a computer patch was available for the problem, but it usually did not work and it could make the problem worse.