Buick lesabre acceleration, stalling, and starting problems

Yesterday driving home from weekend up north the
car began to jerk and felt like it was bogging down
while on expressway.  After about ten miles it
began deceleration and jetting.  We pulled off at
exit and after idling for a few minutes it started
accelerating normal.  Back on expressway and
after 25 miles it started jerking and bogging down
again.  Pulled off into church and it would not fully
accelerate and stalled.  Started right back up and
drove bogging all the way to gas station and added
gas although it had plenty.  It started idling and
accelerating fine.  Back on exressway and another
20 miles and did same thing.  This time it slowed
completely down and wouldn't restart.  Left it
overnight and went back today and changed fuel
filter.  It started right up and got me 25 miles to
home but was having trouble accelerating the
entire time.  It felt like it wanted to go but just
wouldn't speed up very fast or smooth.  Let it sit
for four hours and then drove to store but it just
felt like it wasn't getting gas and then stalled and
would not start again.  It is sitting up at store right
now.  I think I can hear the fuel pump prime when
key is turned to on position.  Any ideas.  I have
health problems that have broken me financially
and can't afford a tow and a mechanic.  Help
please!