need engine tune up first

你那車可能跟變速箱一點關係都沒有,但engine performance一定有問題。先做一個常規的engine tune up,如換spark plug and wire, 清洗汽油噴頭和throttle body,換ignition cap(if you have), 換fuel filter, air filter, 檢查O2 sensor, 清理 idling air bypass valve, EGR valve, 換PCV valve, 等等。

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