As I mentioned in the no rev issue thread sounds like the vanos solenoid.
/me thinks there(theory) is a batch of faulty actuators which are causing issues with the supra B58 engine.
Located at rear of engine next to timing chain the solenoid controls the variable timing of the engine and...
Has anyone looked at the valve solenoid issue on B58? (VANOS) see below :
This is from BMW tuning on B58 engine issues.
Valve actuator
https://www.fcpeuro.com/products/bmw-actuator-11367614288
BMW revamped the VANOS system on the B36/B38, B46/B48, and B58 engines by replacing solenoid valves...