White smoke means water(antifreeze) is getting into the combustion chamber. A bad intake or head gasket could b the problem but it should smoke all the time. Worn valve stem seals however will cause smoking on initial startup then quit, but the smoke will b light blue. If indeed smoke is white, pull spark plugs one at a time & look for heavy white crust on end of plug, if so that cylinder is getting water in it. Do that to all plugs. Re torquing head or manifold may help but if its high milage almost def need gasket. Heads warp also in that case the head must b milled flat. Valve stem seals can b replaced with head on in some cases by introducing air into cylinder to keep valve from falling into cylinder when keepers are removed. Hope this clears things up a lil.
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