need engine tune up first

你那车可能跟变速箱一点关系都没有，但engine performance一定有问题。先做一个常规的engine tune up,如换spark plug and wire, 清洗汽油喷头和throttle body，换ignition cap(if you have), 换fuel filter, air filter, 检查O2 sensor, 清理 idling air bypass valve, EGR valve, 换PCV valve, 等等。