Hi
When you say the plugs were oily were they:
black/ Oily on the electrode- the bit inside the engine or
sitting in a pool of oil
outside of the engine as you undid them. If the latter then cam cover gaskets and only use Opel - At a guess about £60 maybe 75 euros here. maintenance guide here
http://www.omegaowners.com/forum/index.php?topic=90542.0HT leads do fail. If you have a look under the bonnet in the dark (with your tie neatly tucked away) with engine running you shouldn't be able to see any blue sparks arcing from the plug leads as you rev the engine up. If you do then it may well be your plug leads. If you do change HT leads the other end(i.e. not the spark plugs) is tucked down the back of the engine. Have a good feel first and familiarise yourself with the layout in your mind before removing the leads. Have a look at a picture of the DIS pack in the maintenance guides to see what you are connecting up to.
I have a bag of HT leads some of which might be faulty.
If you see one arcing I might have one I could post you to avoid buying a full set.
A coolant flush wouldn't help but make sure you are using proper antifreeze and not water or antifreeze and topped up with water. These engines do not like plain water!
Is the hesitation at 50 mph when you put your foot down?
One final thought is it might be an air vacuum fault. Under the bonnet you will see a network of black plastic tubing about 1/8th inch diameter linking various parts of the engine and controls. A leak or a detached pipe can cause trouble. carefully check all the joints. A rubber bend on one of my cars had a crack in it. The black pipe itself is robust enough unless it has been chafing on something.
HTH
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Topic: Trusty Alternative Gasket Providers (Read 814 times)