I have coolant getting into cylinders 1&3. Is it the manifold?

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