Shudder During TCC Lockup
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: TCC clutch piston slippage or burnt, low line pressure, TP sensor malfunction, VSS failure, input/turbine speed sensor malfunction, TCC control solenoid valve sticking, faulty valve body, and/or poor ground to sensors or solenoids.