What is your car used for daily? What miles do you do?
If local only you have your answer. This forum is a wealth of knowledge and nearly every problem encountered has been covered before.
Just needs a bit of research.
I have a is220d 2006 which I've owned for two years and only because my budget wouldn't stretch to an is250 manual at most.
The only problems I had was when my daily commute was too local.
Since a change of job and nearly 20,000 miles later not a problem traveling just 46 miles a day five days a week.
My car is on over 160,000 miles. Has never let me down.
Your problem could be one of many things including a MAF sensor that needs cleaning to a dpf that's partially blocked etc.