Type of car.. 1991 lebaron 3.0
My car is HARD to start (now) before it was running real sluggish..
acting like it wanted to stall out (actually did stall out).. but only
while driving it (steady pressure on the gass peddle)  when it started
to act like it wanted to die out I would give it full throddle and it
would stop for a bit but then go right back to acting the same way..i
replaced the fuel filter and that seemed to help for about 1 hour.. I
parked the car for the night and went to start it the next morning and
the same thing was happening... I disconnected the battery for 30
minutes and now when I try to start the car all I get is a single click
and then everything goes dead..

Ok.. now the questions..

1.. what could possibly be wrong..

2.. how do I check the codes..

3.. why won't she start now after I disconnect the battery (I should
say I CAN jump start it with pressure on the gas peddle but once I
remove my foot from the gas peddle the car dies out right away)..