Try this before having the dealer do the same exact thing for $100+.

Accelerator Pedal Release Position Learning
1) Leave ACC pedal "as is”
2) Turn IGN switch “ON” – at least 2 sec
3) Turn IGN switch “OFF” – at least 10 sec
4) Turn IGN switch “ON” – at least 2 sec
5) Turn IGN switch “OFF” – at least 10 sec

Wait 10 sec for next procedure

Throttle Valve Closed Position Learning
1) Leave ACC pedal “as is”
2) Turn IGN switch “ON” – appr 3-4 sec
3) Turn IGN switch “OFF” – at least 10 sec

Wait 10 sec for next procedure

Idle Air Volume Learning
1) Leave ACC pedal “as is”
2) Start engine and warm up to operating temp – temp gauge around middle
3) Turn IGN switch “OFF” – at least 10 sec
4) Turn IGN switch “ON” – 3 sec
5) Fully depress and release ACC pedal – 5 times within 5 sec
6) Wait 7 sec
7) Fully depress ACC pedal for appr 20 sec – during this time CEL blinks
8) When CEL light is “ON”, not blinking – fully release ACC pedal
9) Turn the engine “ON” within 3 sec
10) Start engine and idle
11) Wait 20 sec
12) Rev engine 2-3 times and check IDLE

IDLE = 700 rpm

 

what does it do?

 

I'm guessing your throttle body froze up a bit or something, and now your car does not know what position the throttle body is. DaveB just showed you how to reset everything so your car can relearn and it stop tripping out by revving itself. It's a perfectly safe procedure...

If this doesn't work, and I do mean if, then I really don't know what it could be. (I can't speak for DaveB)

 

Since you have an 05, you do have rev matching - so when you slow down it will rev match as is goes down through each gear. If this is what's happening, it's all good and you don't have a problem at all.