Urgent: Oil leak and performance mishaps (please help soon)

i have a 2000 model 3.8l 6v mustang.
It seems to have some sort of oil leak. the oil is red but the gear oil level seems to be fine and has not reduced yet. its been over a month.
Recently the car just stopped while driving. but on turning the ignition started normally.
it seems to be requiring more accelaration to shift gears. Power seems to be lesser. please help