So my 2006 Lexus gs300 had been running rough and eating a lot of gas only getting a 11 miles to the gallon one day I went to leave and it won’t start it act like it wanted to but didn’t so had battery check it good came out two days later tried it again started right up. But then puttered and shut up and it won’t. I can’t drive it won’t start up. Do you guys have any idea what is wrong with it? I am a female, single mother, I known about it a word to.