Seem to have a problem with my GSi on occasions, a few months ago i was parking up and suddenly the car wouldnt idle properly-it was like it was just about to stall, the yellow lights came on and then the revs would suddenly shoot up and then yo-yo between nearly stalling and revving again!
The engine management light came on so got it in under warranty and they put a new "boost pressure valve" on it.
Everything was fine but on two occasions it has occurred again, both times i was stuck in traffic on the motorway and it occured for about 10mins nearly stalling then went completely back to normal with no engine management light coming on!? Car drives suberb at the moment so just waiting for the next time it does it! Oh and the two occasions were 3months apart!
oh also when this happens the needle on my water temp gauge goes right down to the bottom! only returns back past the 80c mark when problem dissapears!
Any1 any ideas why this is happening??????