I've got an S-reg Corsa with a 1.4 litre 8 valve (HiTorq) engine, which has had an intermittent engine fault for most of the year that I've owned it. The problem is a sudden momentary loss of power, which causes the car to judder. I have been able to demonstrate this problem to my local Vauxhall dealer, who diagnosed it as an EGR fault, and replaced the EGR valve. Unfortunately, this has had no effect. The garage have run a Tech2 check on the car, which did not reveal any further information. This problem seems to be related to the amount of petrol in the tank. It is at its worst when I have just refueled, and gradually diminishes until the tank is about three quarters full, after which it hardly ever occurs. It is also effected by petrol quality; I usually use Shell Optimax, with which the problem is merely annoying, but with Tesco unleaded the sudden loss of power is sometimes large enough to be dangerous. Can anyone suggest a solution, or recommend another garage in the Maldon, Essex area that I should take it to? Thanks in advance, Rob
