问:我的车发动不起来。诊断测试阅读P0420催化剂效率低于正常(银行1)。这就是为什么它不会开始?

我的车在我开车的时候切断它。我得到了一个跳&开始备份然后切断了几分钟后。我跳一遍和它开始。我马上开车回家。我是四个街区。汽车几乎做到了。引擎将加快、停止加速,停下来。它不会超过10英里。指导也僵硬而发生了这事。再次切断了当我到家了。 I was able to start it back up after about 30 minutes without jumping it. I let it run for a couple of minutes but I didn't drive it. The next mourning it started & I attempted to take it to the shop. I stopped at the store about 2 miles away from my house & it cut off again. I got a jump & it started. While it was running, I disconnected the negative cable to the battery & it cut off immediately. I jumped it again & it started but kept cutting off before I could drive it so I had it towed home. It's been 2 two days & it won't start. I haven't jumped it again. It does have gas.

我的车有145000英里。
我的车有一个自动变速器。