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I have a 1981 eagle with the 258-six-2v. The engine has a pronounced miss at idle and when running at even throttle. The miss is absent under load or accelleration.
I have checked compression on all cylinders and they are all within tolerance.
I have pulled the valve cover and checked all the rockers, etc. I have replaced ALL vac. lines. I have rebuilt the carb, replaced plugs, wires, dist, cap and rotor.
It has an "Engine control module" whic only controls idle and simple emissions. It does have electronic ignition. I believe it is the same setup used in the Jeeps of the same era. I know the engine is the same.