Laguna Coupe 3 180 lumpy idle

I have a Laguna Coupe 2010, 180 Monaco and the idle drives me mad! I have had it checked at Renault and they say all is fine but i hate it. The thing is very lumpy on idle and everythiing shakes and rattles, the drivers door mirror even blurs a bit. I am about to sell the car because of this but really dont want to cus i love everything else about her. Any suggestions, she has only done 22k and has fully history, tried all the cleaning stuff and the expensive diesel, no difference. I have heard stories about injectors needing cleaning, fule pressure regulators, increasing idle speed and even a remap to sort this out, can anyone help, i am desp to get this fixed, many thanks, jon