The issue is worse on hot days but is still present in the cold.
I drive a 2000 Subaru Legacy L with 120,000 miles on it. Not sure about the engine size. It jerks and shakes when stopped in drive (like at a red light) never while driving. Occasionally while in park the rpms will bounce around. Hesitation is also occasionally an issue. Overall it's like the car is... Tense. The o2 sensor and catalytic converter where just replaced. It never acts up for mechanics, so I'm having issues getting a diagnosis. Any ideas?