My car keeps dying, and it doesn't care where it does it!  The coil was
changed, and it ran a little better, but a day or so later, started dying
once again, and this time the check engine light came on.  A friend of
mine, did a tune up, replaced the spark plugs, wires and also changed the
fuel filter. He told me to put a bottle of fuel system cleaner in my tank,
in which I did.  I heard it'll work after you use up the full tank of gas.
Problem is, I can't start it to use the gas.  The check engine light is off
now, but the car still keeps dying whenever it pleases.  Can someone PLEASE
tell me what's wrong.  I have already put $400 into it, and can't afford
much more.  I will appreciate all help.

Thank You!
Linda