Fuel issue i think?

I bought my 2001chrys t/c 3.8lv6 used
from a buddy and it had sit for IDK how
long before I bought it but it ran great
up until I filled it up with gas for the
first time about a month ago and every
since then I've had nothing but trouble
with it missing and just extremely bad
jumping and jerking like it is not getting
gas so I put some Lucas gas treatment
in and it still was doing it so I put some
seafoam in it as well and it seemed like
it ran worst after that then a buddy of
mine came over and revved it up like
two times and it ran great again until I
put about 6.8gallons of gas in it about
a week later and now back to running
like junk again so I repeated the same
fuel injection cleaning process that I
have stated above I am out of options I
am not mechanic inclined towards this
problem I just bought a new fuel filter
for it today it is the one that goes along
the frame rail I just need to know in
detail how to install if possible please
help me out so I can be at ease with
going places with my van again