Hi guys
Thanks WRXTASY for the tips
So is the 5w/40 synpower to light or too heavy for the AVCS
I also think the verso reflash sounds like it could be the answer to my probs
although its a little hard to find a thread amongst the many threads about verso that actually explains what verso is
Ive read plenty of replys from noobies requesting an explanation of verso but there is no anwsers............

For those wondering what im dribbleing about
I have a stock standard MY03 WRX that has a jerkiness to its acceleration
which is worsened as the pedal is pushed to to the floor.
The Car has just been picked up from local subaru service center after 4 days work being completed.
They reported the problem ( after swaping all sensors, plugs, coils, etc and checking fuel pressure boost, cam timing) was a faulty throttle position sensor.
On leaving the yard and opening up the throttle out on a stretch of road I found that it was no better at all.
I returned to the dealership and the dealer took it for a drive with me
He said what my car is doing was typical of wrx`s
I was then invited to drive a bugeye to compare.
The bugeye did have a slight jerkiness to its acceleration but was not as bad as mine.