2.4 cabriolet b6 running problem

[kyle_]

Hello, I'm looking for some possible causes to a recent intermittent running problem with my Audi a4 cab. Lately when I start the car up it makes a blowing/rattling sound but once the revs settle the noise stops, however the car shakes violently when idling. It has also started to seem.as though its struggling for power and when I reach over 2000rpm it starts sounding very unhealthy. As I said at the beginning its an intermittent problem, some days it will run perfect and others it will seem.as though its about to explode. I wondered at first if it could be the clutch as pulling away can be a struggle and I need to give it a bit more gas than usual but it can pull away in any gear and I can cruise at 30mph in 6th gear with no problem so surely it cant be the clutch?

Sorry to waffle on, any help or advice will be appreciated.

[rhencullen1989]

Duel mass flywheel???? Does the clutch judder on take up on low revs?

[fourringsrus]

Had similar noises etc with the 3,0 v6 and the problem was coil pack causing misfiring and therefore lumpiness and poor performance etc

[kyle_]

The car only judders when the car decides it doesn't want to run very smooth other than that the clutch is absolutely fine.

How much is it to replace a coil pack? Is it something I can do myself?

[fourringsrus]

Replacing a coilpack is no more tricky than changing a spark plug or HT lead, as for cost ,I couldn't say.
Before you get carried away though, it would be a good idea to have the car scanned for potential fault codes and go from there.
Would have replied last night but the computer was having a divvy day
Good luck

Stuart