Robbie89t/a

ok so we've had a 89 ta with 43,000 miles sitting in are barn for awhile and my parents are finally giving it to me and when i try to start it , it only starts sumtimes idels real low only about 500rpm and we think its not getting enough fuel perssure so we changed the fuel filter and drained the gas thats been in for it for a year or so but still runs real ruff and when u put it into gear it will just sit there even if u have the gas to the floor so im thinkin its fuel pump ... but do u guys have any ideas ??