[cadillac_al]

I think it is next to impossible for the distributer to misfire only 2 cylinders. All 8 have equal access to the rotor. Now, since 8 and 4 are next to each other, there may be something to it. Maybe there is a defect in the cap, or the rotor may be wobbling pretty bad. I have never heard of this happening before though. I wonder what the plug gaps are on those cylinders. Sometimes I reduce the spark plug gap to .045 when the manual recommends .060 or .080 because I don't believe the HEI can fire .060 unless everything is perfect. When I changed the plugs in my deville they were all gapped at .030; must have been an old timer that put those in. I can't remember if I gapped my new ones at .045 or .060 but sometimes you can't change them that much without putting the electrode at an odd angle.