HELP!! with my 75 Dart

If carb hasnt been touched until recently, i would say its likely in need of a good cleaning. Never mentioned what engine it has and if its a 2 barrel Or 4 barrel carb.
Had one this spring that all it needed was a good cleaning and it ran perfect after.
Another trick is to pull air cleaner, rev engine a little and push choke plate closed,as plate closes snap throttle.sometimes this dislodges the dirt that is fouling the jets.