2002 Honda Civic (Please Help)
 

I have a 2002 Honda Civic EX. I am having trouble with the
cars gas mileage and also with power. Here is what its doing: Every
time I get to a ¼ of a tank it runs really bad. At first when I am
starting my car it has to crank like 4 or 5 times before it will fire
up but if I crank it once or twice and then turn it to the off position
and then try again it will fire right up like it is suppose to. The
other things it is doing is it will stall out on me when I try to
accelerate and sometimes will die unless I ride the clutch. Then when I
am just sitting at an intersection it will stutter and bog out like it
wants to die. The catch to it is though when I am on a full tank it
runs fine except for the bad gas mileage. I am not a mechanic by any
means and I have taken this car to 3 different people and have gotten 3
different answers. I am tired of wasting my money with dishonest
people.
The check engine light is on and it reads P0171 System Too
Lean (bank 1), but why would I be getting this bad of gas mileage. When
I say I am getting bad gas mileage I am getting about 200 miles to a
tank and anyone who owns a Honda knows that's horrible. The problems
that have been told to me are this

1. That I have a crack in my exhaust manifold.
2. I need a new fuel pump.
3. My fuel gauge is off and maybe a bad injecter

I have use some injecter cleaner on the car and still nothing
so I am hoping some one on here might be able to help me out on
figuring out what's going on so I can get my car back to normal
conditions.

Thanks
Aaron