[THE NEW GUY]

it not a tire. Those are new and never fixed. I had the same problem in winter with my new winter tires. It's like one cylinder wouldn't work. That's why I checked injectors, spark plugs, vacuum and compression. But it's not the engine. CEL is off. It's like power transmission is intermittent, like it would not transmit power or torque (or transmit less ) at certain point of every revolution of the drive train, and get into resonance with the rest of the car when running between 90 and 110km/h. The rest of the time is still there but is not critical. I tried with only FWD and the problem continues... I don't know what is next.
Any ways, I checked the motor mounts and tranny mount too: normal.
Does somebody thing that it's possible that torque transmission were intermittent? may be there's a leak of pressure in the gear box in any rotative part... and the transmission oil returns to the tranny carter instead of pressing the discs... I don't know.