tune up

i wanna do a tune up on my C280 ,2000.i have my spark plugs already but unable to take out the old ones.any one has any idea if there is a special instrument to do this job

Do a search on this forum. We talked about it in details a while back.

If I am not mistaken...there are coils sitting on top, and you have to remove these coil packs. You will need hex key to remove the coil packs (someone please correct me here if I am wrong). There are 2 plugs for each cylinder -- a total of 12(wow!); I am sure you already know this.

It is not difficult. Just that...things are very fragile and you have to exercise caution so to speak. Be gentle like a watch-repair man. Don't force things. If a part is not coming off easily, sit down, rethink, and change your method. You can break many things here and they are expensive.

Thanks.but after getting the tune up done,there is a gasping sound emitted when i step on the gas pedal aswell as the car speed not responding to pressure on the gas pedal.i did not interchange any of the coils as i did it numerically.
i have a sugestion that the coil is not properly fitted on the spark plugs cos it sounds like a leak of air when it gasps.Please if any one has any more suggestions ,i will really be gratefull.

What do you mean by gasping?

Is your car stuttering upon acceleration? Feel any jerks?

Does it drive as if there was water in fuel line?