My wife and i were out cruising the other day, and i hit the gas to pass some semi's. I noticed that after the high RPMs that pressing on the pedal did very little to nothing at all. It was pretty scary, and kind of exciting at the same time. We pulled off the freeway to see if it was just the speed that we were going that caused it. After coming to a complete stop (and making sure traffic was clear) we attempted to leave the stop sign... with no success in that department. When the accelerator did finally 'catch' we left the area and stopped at a gas station; turned the car off and figured maybe it might be a fuel issue. After fueling up and starting on our way the car accelerated as it would normally. So, from trial and error, we know that if we have that issue to pull over and shut the car off, then turn it back on; until we can have it looked at.

Is there any tips, comments, or any other kind of help that could help us figure out the problem faster and be able to tell our mechanic, so it doesn't end up costing my other arm and leg...

 

SRT or N/A?

 

Its a 2005 XF Coupe Limited

 

Try a throttle reset :
Keep the key in for the entire process.

1) Turn the key to the on (not start) position, the position just before the starter turns over.

2) Press the gas pedal to the floor with the key in the "on" position.

3) Hold the pedal to the floor for five seconds, then turn the key back
to the "off" position (don't remove the key), then release the gas pedal.

4) Wait 2 mins. for a full alignment.

Summary: Key on, pedal down 5 sec, key off, pedal up, wait 2 minutes.

If this doesn't work, disconnect your neg. battery cable for 20 minutes.
This will re-set the parameters in the drive-by-wire

 

I did try that and it happened again while i was sitting in a left turn lane, except this time it was "locked" in Nuetral, just revved and didnt go anywhere... had to turn off and back on to reset it

 

I can only suggest you have low fluid in the transmission.
Or
The electrical/solenoid plate in the transmission is acting up.
If so get the codes read and see if any have been set.

 

Alright, its been awhile since i was here. i have since taken the car into a dealership and they replaced the map sensor (under warranty). After getting the car back it seemed like a new ride, then the acceleration issues popped back up, with it sticking in a gear (or appears to be sticking). Now that the car is no longer under a "warranty" im a little hesitant to take it back to the dealership, without actually knowing what to tell them or how to explain it.

 

Listen to onehundred80, I had the problem with the transmission sticking in 2nd gear, the "Limp home" mode. I didn't have the issue of no acceleration, but replacing the electronic plate solved my problem and the car acted just like new again. As many others I don't recommend taking it to the dealership if it isn't a warranty job. I think it would be of your best interest to scan with an OBD2 and see what it throws before buying parts of paying for additional diagnostics/labor at the dealership.