what does it mean when white smoke comes out from the engine?

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ok so before, my car has been having problems. it was misfiring in cylinder 1 and 3 so replaced the sparkplugs, spark plug boot and the coil plug boot. i also gave it an oil change and everything seemed to be fine and i did this like 5-6 months ago but now recently the idle went really low to the point if im not going at least 5mph the car dies on me. it feels jumpy like the engine is overexerting itself and the whole car smells like burnt. white smoke is also coming from the engine so for now it is in my garage because even if i want to drive, the engine wont turn. it will start but it doesnt catch. anyone know what it could be?