1992 Regina 740.

Developed an idle only misfire in number one cylinder. I can pull the plug wire or injector wire without change in engine sound. All other cylinders have a large change when plug wires are pulled. Start it cold and I can easily touch the number one exhaust manifold header.

If I chock the wheels and put it in drive the number one cylinder will try to fire ( By going to the back of car to check exhaust sound) If I brake torque it the dead cylinder comes alive and there is no misfire. But I think it is weak.

What I've done:

Swapped the number one plug wire and spark plug. No change.

Swapped injectors 1 and 2 plus connected the number 2 injector wire to number 1 injector. No change.

Injector balance test with injector tester. All injectors test within 1 psi of each other. Fuel pressure is dead on and regulator is working and not leaking.

Checked cam timing, belt is tight and marks are dead on

Checked for vacuum leaks and sprayed carb cleaner all over the intake and hoses.
Pulled intake manifold anyway and checked gasket and manifold for cracks all ok.

Pulled distributor cap and rotor ( 4 year old Bosch ) Ok no cracks or carbon tracking.

Checked ignition timing ( diagnostic purposes only) 10 degrees BTC.. Ok

Cold compression: 1-4 all between 175 and 177 psi.

All engine and body grounds listed in the faq.

Head gasket, valve seals and valves lapped 4 10,000 miles ago. ( for fun )

I did more but I think this is enough....Thanks to everybody who has read.