Mitsubishi 3000GT Service Manual page 626

AUTOMATIC TRANSAXLE - Troubleshooting
Pull the parking brake to set it securely.
clutch system
Set the selector lever to " P" or "N", and start
With the engine idling, depress the foot brake
firmly.
Let the engine continue idling.
I
TSB Revision
Improper adjustment of idling
I
Readjust the idling.
torque converter clutch
solenoid. I
Replace the torque converter
clutch solenoid.
Sticking of the clutch control
valve
Overhaul the valve body.
Sticking (seizure) of the torque
converter clutch
Replace the torque converter