From some googling.
With a 16-valve overhead camshaft configuration and a sequential electronic fuel-injection system, the "5.0L" engine of the 1999 Mercury Mountaineer generates 215 horsepower at 4,200 rpm and 288 foot-pounds of torque at 3,300 rpm.
It features a variable length intake manifold and produces 210 hp (157 kW) and 254 lb·ft (344 N·m)
so 5 more hp and 34 more torque.
so bad gears + 33'' i can see why its slow :P haha