Most likely going down hill, the faster the wheels go, the higher the RPM will increase, for this to increase the vehicle either must be going downhill with no brakes applied or the throttle(acceleration) has been depressed.
A lot of possible causes, I recommend a careful investigation.
For starters change the fuel filter
Cylinder miss.
Your alternator is probably not keeping the battery charged while the car is running. You need a new alternator!!
will the transmission causes my 1999 ford expedition to bog down & sputter when accelerating the 4.6liter engine.
This depends on how you define your axes. Let's assume they're defined as normal (being positive is accelerating, negative is breaking, and for velocity positive is driving forward, negative is driving in reverse). Then of course, you are speeding up. This simply means the train was in reverse, but it's accelerating in the positive direction now.
you need to get new spark plug leads
I means you need to get a new car those are outdated
Press the brakes or down shift
A car can be slowing down while still accelerating if its speed is decreasing but the direction of its velocity is changing. For example, if a car is moving in a curve, its speed may be decreasing but it is still accelerating towards the center of the turn. This is known as centripetal acceleration.
A damaged catalytic converter could cause that.
the wineing is probably the fuel injecters because that is what was wrong with my dads truck.