Buy a Mass flow air sensor and try it.

If it doenst cure it, you can resell it.

It installs in a minute.

some guys have had luck cleaning them . I had no luck cleaning mine.
In fact , I have an extra one in stock.

when my ignition wires started to fail I thought it was another MASS ( mass air flow sensor) and bought another one...but didint need it.

kept it as a spare. Its one of the weak spots on the ML.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles