1984 200es wont start

Hi i got a 1984 200es i havent drove it for awhile i may have let it sit for about 2 weeks or longer it started up fine before i put it in the shed but on last thursday i went out to start it up to get everything moving around and it didnt want to start it will roll over and sometimes it will.start but lately it just floods it self fast and just keeps rolling over i did keep switching the spark plug i just bought a knew one and it started up so i thought maybe it was that but last night i went out to start it and it just rolls over and floods it self like it was does anyone have any idea whats going on