2001 pontiac sunfire shifting issues

What is your question?

Trouble shifting into higher gears without really stepping on the gas pedal, then it does. Acting like it wants to stall out at red lights and stop signs, so I keep the revs up a little so it won't. If it does stall it's acting like it's flooded so I put the pedal all the way down then it starts. Then when you put it into gear it stalls again. Have to keep the revs up a bit then shift into gear to keep it running but this isn't good for the transmission as it gives quite a bang noise. Could it be the fuel filter ? fuel pump ?

What makes this problem better or worse?

it's periodically happening

How long has your 2001 Pontiac Sunfire had this problem?

A few months