Peugeot Idling Problem?

Hi all, could really use some guidance on this,

I have a 1998 peugeot 306 2.0 XSI and recently i have been problems with its idling.
The needle on the rev' counter oscillates between 300 - 1500 rpm,
and more often than not the engine just cuts out. The problem
occurs when the clutch is pressed down. This problem is intermittent,
it will happen on only a few days in a month, but when it does happen it will continue
throughout the entire day!

I have read similar problems on this forum, along with their solutions, but no one has
really come back and said that the problem has been fixed

Any help or advice is greatly appreciated

Thanks in advance guys!