I was driving my 2001 altima when ower steering was lost and the car shut off. The car would star but would turn off right away even wheb given gas . its killed 3 batteries. I was told the spark plugs were bad and crankshaft needed to be replaced. So that was done. Same problem still. Next the distributer was replaced. Also furl treatment placed in gas tank with gas. While driving a huuuuge thick white cloud and strong smell of gas followed mewhile driving. Again the battery was bad and car shut off and woulnt start. Last the alternater was changed the car started and no more smoke. When on, the car engine bounces alot and sound kind of like a tractor. Possible broken motor mount .i did not drive the yet. but i was told not to put more money into it. Consider it done with. What can be the issue? And is it worh it?