2003 Mercury Sable
When accelerating from stop sign, red light, attempting to get on the highway the car has no power when applying pressure to the gas pedal. Struggling to get past 20-25 mph. Once I release pressure on the gas pedal the car will get up to 35 mph and will run fine gaining speed and going 60 mph with no problem. When I come upon a red light or stop sign again it does the same thing.