I have a 2004 WRX PP with 40k on the clock.
In the last couple of days the following symptoms have started up. If in 3rd, 4th or 5th gear at low revs and I hit the load pedal, the revs appear to drop and you can feel the car lose power. This happens only for an instant and if I back off and boot it again the problem usually goes away?
Thought it might be the clutch on the way out but not so sure now.
Anyone got any bright ideas?

 

Revs would normally increase with a duff clutch.
Check the normal, pipework, maf, etc.

 

Has there been any work done on the car recently?

 

It had a service 2 weeks ago.

 

As mentioned before check all pipes. I had this and it was a pipe on the turbo that wasnt fitted properly and I had a whoosh and a loss of power when I accelerated

 

Thanks - head under bonnet this weekend I guess

 

come back and let us know ...