Car: i20 petrol, 5 years old, 90,000km, tires, brakes new, patchbook. I have the following problem on average every 4 weeks (since about 6 months) for a short time. -poltern, drowsing from the engine compartment (feeling right at the front) for a short time! -Always on the highway at approx. 100-120kmh (no matter which gear, also free run) -poltern,dröhen as if you drive over cobblestones -On the road surface it is not, also not on the tires (problem summer like winter tires) – exhaust is fixed, also no lock find out parts in the engine compartment -No warning message on the display (ABS etc.) -If you then slow down speed below 60kmh (departure from highway) the problems stop -after that no more problems, until they come up again -leakage without problems! Also with strong steering! Otherwise also no abnormalities. Maybe you are aware of these abnormalities. Can I check something myself? ?(Motor suspension?) Yesterday I had the problems. Since then everything o k. Addendum: Have looked at the coupling rods (rube). Both have easy play. When you shake at it you hear a clacker. But you don’t have the feeling that this would be easy. Easy game stop. Otherwise I have not discovered loose connections. Also nothing turned out etc. Thanks!