What could it be sensor fuel pump or tansmission

What is it? Its a Nissan, so get as much speed as you can build up and jump it Evel Knievel style over the biggest span you can find. Laughter make the heart stronger. You need to have someone run a computer on it to see if there are any stored codes. Local auto parts store will do it for free but give you a long list of "possible parts". They just hope you throw parts at it until its fixed. Your question is kinda hard to follow though. Try test driving it in the back roads close to your place writing down everything that happens on paper. How many times does this or that happen, does it stall, temp go up, rev out, jerk or nothing? More info you give better answer you might get.