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Does anyone know if a 1985 Merc 25XD was designed to only run on one cylinder at idle? I know there were several engines designed that did drop cylinders at low idle to reduce fuel use. I can't believe they would do this with a two cylinder leaving only one to run but who knows?? May be why...
Owed since new always been cold natured rough idle %%$#! Started missing on bottom cylinder at idle and low rpms. Pull wire to bottom cylinder rpms do not change on motor. Pull top wire engine stops cold. Checked fire, plugs and coils all check ok. Swapped them around and problem remains...
