Hi I have a very interesting problem with my ED gli auto and I would like some help ? The engine is missing throughout the rev range on 3 cyc I have done the Following Compression all cyc 1150 kpa+ changed the inlet manifold gasket ,changed the no3 injector ,checked plug leads changed plugs , Could a blocked bleed hole in a tappet keep the exhaust valve open at idle but close in on slow crank speed when testing compression HELP I am S+++++d Roy

I'd start by checking the dizzy cap, they have a habit of corroding the number 3 lead connector on the cap.
I'd do the cap and rotor Button if you havnt already.

How did you check the leads?

Any idea why #3 goes more than others?

I don't but I've seen it on a hand full and on mine, number 3 on the cap completely white/green and the rest fine. Might have something to do with position.