W210 IDLES FUNNY
Plugs are $3 each at your local auto supply store.
You are lucky they did not do the labor and stick you with an unresolved issue and a $880 tab.
Look before you leap next time.
I noticed start up idle issues sometimes if my car sat for 2-3 weeks without starting.
If that's the case, you can turn the key on without starting engine and turn off and do that a few times to get the fuel pump to pump up the gas to the engine.
Then start the engine.







