UPDATE 11-27-6 The new Air Mass sensor arrived. I installed it in 120 seconds. Drove 7 miles. Still have problem. I am hoping the computer has to take time to adjust. I will get the codes checked as advised today.

UPDATE : Codes read. PO300. multi cyl mis fire. PO301 to PO305. mostly cyle #2. autozone guy said plugs or wires. I only have 20,000 miles on these plugs. all of a sudden they go ? Bosch platinum 2. he wondered if i put them in tight - gapped them and put the caps on tight. yes yes yes.

DEC 1st 2006 UPDATE: One thread I read the owner said the MAS installation didnt help until he had his codes reset. I have not done that. Another said the dealer should update the computer codes. That sounds like it should be free like windows update. Can anyone verify?

12/8/2006 Today my Mercedes Is running great. I believe CURED.
the dealer installed 2 cats, reset the codes, and fixed a vacuum hose problem. The service mgr said he wanst sure what was done on the vacuum hose. I wish I had exact details to post. $80 was their labor charge. Cats would have been $3,000 but fixed under warrenty.
12/11/2006. Not Cured totally. Rough Idle, check engine light back on. I bought a code reader today. PO170 PO173. Ive changed the leading causes of these codes. (MAS)
jan 2007 - Ordered my 2nd New Mass Air Flow Sensor. Waiting for arrival. I suspect and almost hope my 1st one was defective.
JAN 13 UPDATE 2007 2nd new Bosch Mass flow air Sensor made no improvement. I sprayed starter fluid around the engine at idle and the rpm's picked up. I then found a vacuum gizmo had come off. My only problem now is a not so perfect idle. slight mis. not enough to give off a code.

__________________
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