I have a 2008 WRX with 100,000 kms on it. Lately I've been having an issue whereby, especially in 2nd gear under an attempt to accelerate quickly (with clutch completely engaged), the car seems to have somewhat "jerky" acceleration through the rpms. Car almost feels a bit shaky.
As this has gotten worse, it also feels like getting off the line in 1st at lower speeds is also a bit shaky.
I've tried the age-old highway test to see if the clutch is slipping, and it's not.
Is this still the clutch, or something (likely) much worse?