i have a 98 astra sport with the x18xe1 engine. Its had a lot fo work done, including a full service and a coilpack change as it had a missfire and that code was read.
Now the EM light is still coming on and off depending on how i drive when its on performance is massively decreased. If i play with the clutch and rev it up especially when moving off then it drives ok, not perfect still, if it bogs down slightly the light comes on and the car becomes a dog. Even when the light is off and driving ok it can judder in accelaration in all rev range.
extra info on car - kn, staright through exhaust, egr blocked off.