I have a 2007 Ford Escape XLT 3.0. I'm having trouble with it jerking and using a lot of fuel. The codes showed #3 injector. I've changed the #3 3 times, as well as coils, plugs, PCM, and now exhaust manifold gasket. After driving it, my oil light is now on, as well as my battery light. It won't start, and there's a gas smell in my oil.