Dirt 2.0 (DiRT Rally 2.0)

Good day, drivers, description of the problem, Logitech momo racing steering wheel, but the problem with the pedals in version 2.0 is very bad, I can’t maintain certain speeds, the car either picks up speed or drops, in short, I can’t dose GAS with the Dirt Rally version, there is no such problem, consequently a problem not in the pedals how to set up someone tell me the thread, otherwise 3-4 hours of googling and shamanism did not help the translations I know but I don’t understand what the trouble is thanks in advance