2001 Mitsubishi Eclipse GS that won't stay running

Hi all, I have a 2001 Mitsubishi Eclipse GS that won't stay running, I just changed the spark plugs last week because it was mis-fire and bucking. It was running all morning in the drive way then i shut it off and 2 hours later went to start it and would'nt stay running. when I hammer down on the gas it still stalls... Does anybody have an idea what's up with CAR???

Thanks, Mits2001:confused::confused::confused: