问:汽车驱动差重燃油消耗和糟糕的传播

汽车从海外购买。检查引擎灯自购买。困难的传动齿轮尽管蹬车。Suffling和拖移。这是166000公里。它开始过热,后来被告知头垫片吹。这是修理。但发动机从未最佳。我被告知我不得不改变我的传动箱;花费高达980美元购买一个新的传输和安装后……并没有什么改变! ! ! ! i changed my mechanic to one who said he would do a diagnosis and came up with Po..112.; po..527.; po227..; p0..1100 codes. Don't know what he did but drive improved a bit....After 2weeks.it has gone back to the same way it was. Shuffling, goes over 4RPM before gear changes heavy fuel consumption No smooth drive Creamy brown dirt in my radiator cap Please help. Appreciated

我的车有166000英里。
我的车有一个自动变速器。