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Thank you.
About off idle behavior. When I brake torque it the misfire goes away at about 1000 RPM. I can pull the number one plug wire or injector wire and I can hear the cylinder cut out. No stumble at all it just comes alive. if I rev it to 3000 RPM in park and pull the number one injector wire there is a noticeable change. If I pull the number two injector wire there is a bigger decrease in RPM.
Cold or hot its always the same. And it starts every time without any hint of trouble.
Plug wires were new ( Napa Belden ) in April.Changed Just for maintenance. I swapped back to the old wires ( thinking new does not mean good) and still no change. I only use plug wire pliers ( soft coated ) The old plugs looked normal with the number 4 having some oil ash. No coolant loss at all and its as clean as it was 4 years ago when I did the head gasket for fun.
Checked for oil in distributor, none and for play in the distributor bushing. No radial play, some minor end play only. No corrosion on terminals in cap or where the wires connect.
I swapped the coil pack from my 1992 Regina 940 and no change. Spark intensity is the same as my 940.
Battery is new and voltage is over 14 volts running. I will check about loading the electrical system.
Additional clues. When I inspected the cylinder walls during the head gasket change I could see blow by marks. I do not remember which cylinders.
Valve adjustment is .017 to .019 and has not changed in 14 years. Sticker says .016 to .018.
Vacuum gauge readings are normal. Except that the needle vibrates so much I worry it will break the gauge. I lapped the valves and replaced the valve seals during the head gasket change and remember it did not make a change in vacuum.
Sorry for the length
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