I have a wierd prob.

after i give my rs a good hammering the car seems to run on three cylinders.


BUT!!!!!

When i pop the bonnet and disconnect the HT lead from cylinder3 and slightly touch the lead of the top of the spark plug, then it will fire up the cylinder again.

when i connect it properly again it goes back to running on three.



New Leads and new plugs being used.
would leaking valve seals have anything to do with this???

cheers