My 99 Astra 1.6 8v has been needing topped up with water every 2/3 days for the past few months (prob. head gasket on the way out) running fine otherwise, but today when I was coming up to a junction it suddenly started to run quite rough.
It idles ok, however when i rev it with the throttle fully open, it judders and nearly cuts out, but just resting the foot on the accelerator it will rev fine. there's no white or blue smoke when it runs.
I was wondering, has the gasket went completely or has something like the egr valve went?
Hoping to fix it by friday for an interview
Many thanks in advance!