1981 120 mercruiser rough idle

Dannysmyk

Cadet
Joined
Jun 7, 2022
Messages
28
Back again,
Dealing with the ole pig "iron duke" supposedly they don't die maybe I should put this one out of its misery. I've been through it all different problems different days I've had the old girl for 20 years now still holding on. Last season I noticed a shake at idle. It's almost like a miss but it's not. Shakes the whole boat. Yes, carb clean, new electronic ignition, new coil, fuel pump, plugs, plug wires, distributor cap, rotor, all within the last 4 years. It just shakes I don't know hast to be a miss right? Levels out above 1000 rpm and willl get up and go no stalling fires with a flick of the key. Confused.
 

Dannysmyk

Cadet
Joined
Jun 7, 2022
Messages
28
Back again,
Dealing with the ole pig "iron duke" supposedly they don't die maybe I should put this one out of its misery. I've been through it all different problems different days I've had the old girl for 20 years now still holding on. Last season I noticed a shake at idle. It's almost like a miss but it's not. Shakes the whole boat. Yes, carb clean, new electronic ignition, new coil, fuel pump, plugs, plug wires, distributor cap, rotor, all within the last 4 years. It just shakes I don't know hast to be a miss right? Levels out above 1000 rpm and willl get up and go no stalling fires with a flick of the key. Confused.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
52,431
you have bent push rods in your other thread. your rough idle is because of that.
 
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