I have a 1999 grand Cherokee limited 4.0. When i start to drive out shifts into 2nd just fine but for some reason it doesn't like to shift into 3rd gear until you rev up to like 4-5k..... I read it could a throttle valve cable? Does that sound correct and if so does that cable since its a external cable have a bracket to it? Or any other ideas why the tranny is shifting like that it will go into third sometimes n jump down to second but after I drive for 5-10 min its shifts smooth everytime. ....