Sorry I wasn't more specific.

The actuator had the infamous ng wire insulation and had to be rebuilt.

When I installed the rebuilt actuator the car had a very rough idle and minimal power. Per 4Mercedes recommendation, I sent them the actuator, ASR & EC modules that subsequently tested ok. After reinstalling these three components, I took car to Neil. Because the car sat for months in a heated garage, carbon residue within the intake dried, flaked and jammed #4 exhaust valve causing the rough idle and low power. Neil has the scanner, experience and expertise to correctly determine the cause.

Bob