Question

2000 Subaru Legacy L jerking issues

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?

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Clarification Request
Temperature

The issue is worse on hot days but is still present in the cold.

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Answer
Poor idle quality

Hi, Subie; How long since a fuel injection service? Many times this will take care of an idle issue. The throttle body and IAC get dirty and sticky and can cause the IAC to be sluggish, causing the low, rough, idle. The throttle body gets 'coked' up, restricting the air flow which in turn, determines engine speed, especially at idle. The best fuel injection cleaning is done with a Snap-On Motor Vac. It cleans the system while the engine is static, then when running. The Throttle Body and the IAC are done manually.

Good luck.

Loren

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