Newbie(I used the search) 420 Stumbles..
I am new MB and have a 420 SEL with 190k. All the usuals have been changed. I bought the car with a rough idle. Was initially told it was a bad plug etc. Long story short the mechanic said it was a fuel distributer. Reman unit came in and the idle is perfect. Now it stumbles out the gate(bad). Any ideas??? Thanks!! This was the only part changed.