Rough Idle and pick up

Hello, I have a 1999 V230 and in the past few weeks has been giving problems. It would have a hard start in the mornings then the idling was rough, worse at take off making the vehicle vibrate violently. I changed the plugs and put new ones. I even changed the MAF (it was busted as well) still that couldn't cure the problem. I even checked for air leaks still the couldn't stop it. The problem only disappeared when I changed the ignition coil and plug suppressors. The ride is as good as new and have learned something new about this model. The good about is that, it is DIY job and hence save a lot of money than taking it to the dealer. Thought it could help someone out there. Cheers!!