Fluctuating Rpm w124 e300 om606 na

[antoniogxxx]

Hello to all
I have a problem with my e300 with om606 naturally aspirated. If I drive at constant rpm from 2000 to 3000 Rpm the car start to fluctuating with rpm. I changed all fuel filters, all automatic transmission oil and filter. I don’t know what could be

 

[Tigger]

Have you checked the fuel strainer in the tank?

 

[antoniogxxx]

Yes changed

 

[antoniogxxx]

I putted also another fuel filter on the feed line under the wash screen tank