Yesterday, I did a valve adjustment on my 1984 300D. It appears now the car is upshifting much faster like at 2000 RPM. I did check the bowden cable and it is connected. I tried adjusting it and it made a tiny amount of difference. I don't think it is vacuum-related as all of the vacuum-related components appear to be working fine. Any ideas? This is really annoying.

Thanks,

Dkr.