need heavy advice freaking new problem

[1iwilly]

i need suggestion as what to test for 100% accuracy. my 02 x5 3.0i has been showing white smoke at start up and a tad running rough when it sits for a long time or over night.then after a few minutes it clears away and runs smooth.and ses on with misfire on cyl 1,2,3 even though it has 6 new coils and plugs i took the ccv out today cuz i order a new one after reading of them failing well there is nothing wrong with it after i took it apart.i took the plugs out=cyl 1,2,3 to check compression. well while cranking it over a substance that looks like antifreeze keeps spitting out of cyl-3.but the car temp is always steady in the middle after warm up i've been stuck in heavy traffic for hours and no sign of over heating at all.how can i check if possible start of head gasket.the old plugs show no hint or sign of antifreeze.