I have a 2003 ford expedition with a 5.4 v8. On occasion when i merged into traffic and i floored the gas, the RPM's will jump high but the vehicle isnt really moving any faster. I have to let off the gas and accelerate at about half gas pedal so it will pick up speed. Any ideas?

 

How many miles since you last changed the tranny fluid and filter?

 

I bought the vehicle last june, so I couldnt tell you when or if it has ever been changed?

 

It should be done every 30,000 miles.