Comi Aventador

Hello guys i have problem when car is running i put in neutral gear and i feel like someone shake my car, in waves shake stop half second then agian.. i feel that most on uphill or downhill, and when is hot outside, i notice depened on temperature of air it's not always same.. when i turn on AC shakes are barrely noticeable. RPM Needle stay still , i check diagnostic everyting is ok, engine mounts are okey. No sound like knocking it's not DMF .. Anyone know what can be problem?