Macky05

Hi guys, I am a happy owner of an E220 W211 with almost 500k km on the clock.A few days ago I felt that my car was braking, feeling like it, because i wasn't touching the brake pedal. It feels like a very consistent engine brake(it's a manual transmission). I observed that this doesn't happen while in neutral and the car rolling, just when it's in gear. Can you guys help me diagnose the problem? Thank you