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Q: I have coolant getting into cylinders 1&3. Is it the manifold? on 2001 Ford F-150

Had the holes blown out and new plugs installed. Mechanic could not find a "trail" leading to the plugs externally. Truck ran fine for about 20 min. (Note: I was pulling a 22' travel trailer) then the problem came back. Misfiring and running rough between 1000-2000 RPM.
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Howdy. It is pretty unlikely it is an intake manifold and/or gasket if you are actually blowing spark plugs out of the cylinder head. Are you going through coolant on a pretty regular basis? I suspect you have a head gasket issue. I would recommend getting the vehicle diagnosed before performing any teardown of the engine. Typically, based on your decription we would perform a block test which checks for hydrocarbons (exhaust gasses) in the cooling system. If hydrocarbons are present, you have a cylinder head and/or gasket issue. It may be something else but this is where we would start. Hopefully that helps!
it could be your head gaskets blown and coolant is getting into your block and pistons like that. mechanic shoulve checked that
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