Nascar Heat 4 and 5 problem

Hi, racers, I need some support if possible. Bought Heat 4 and 5 from steam, for a fair price.
The problem is, when driving in practice, qualification and race, I constant get a severe revs drop, speed is getting slower and slower,
and the thing I can do is getting out of the track.
All my sims work great on my high end rig, and never had trouble with my Logitech g25 wheel.
So I can’ t find how to solve this. Hope you guys have any idea what this could be?
Thanks for your support, very appriciated, Appie
 
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