Slip Or Shudder In Forward Or Reverse
WARNING: This page is about a different car, the 2002 Toyota Avalon and 2001 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Check throttle valve, oil strainer, torque converter clutch, O/D direct clutch, forward clutch, O/D one-way clutch, direct clutch, and 1st and reverse brake.