Acceleration glitch

Hello racers.
I’ve been having an issue over the past few months where I am experiencing a game ending glitch where no matter what car I’m in I get towards the end of a race and the car refuses to build up the revs causing me to lose positions. It’s incredibly frustrating. Happens with the controller and with my TX wheel, t3pa pedal set.
Also happens in online races.
I am playing on my LE forza6 Xbox one where I now play project cars because I’m sick of this happening every time I put forza6 on.
I have uninstalled and redownloaded the game but the issue returns after a few races.
I’ve not found this issue in any thread for a fix.
Can anyone help

Check your profile options and see if you accidentally have one of the damage modes enabled - if you crunch gears or over-rev on up/down shifts eventually damage will kick in. Maybe turn on telemetry when you feel this problem and check what that is showing for damage - think it’s on the last of the telemetry screens.

Precisely. The tranny getting damaged even with clean shifting through a whrrl/pedals or a pad using man/w clutch is a known bug. The tranny’s probably damaged reasonably enough to cos the performance bog down by the time the race is over.

For the OP’s reference:

https://forums.forza.net/turn10_postst90749_Transmission-damage-when-downshifting-with-H-pattern-shifter-and-other-issues.aspx