Intrepid :: Dodge ES Jerking Slightly On Highway - White Exhaust Smoke

I recently had a problem with my car jerking slightly on highway, and I think I've resolved this by replacing the spark plugs. It does still do it, but maybe only one or two jerks per 100 miles. It used to be one or two jerks every 30 seconds. So I think I've found at least part of the source of the jerk. I could possibly purchase new spark plug caps (wires) and hopefully that would put that problem to rest.

Dodge Intrepid ES
3.2L V6
126,000 Miles

So my car has white smoke coming from the exhaust. On start up, on warm up, on hot idle, and on cold idle. The coolant in the reservoir is quite skanky looking and I've been meaning to flush it but haven't gotten around to it. But I've done quite a lot of research lately and also just have my own personal experience (employed as a mechanic at a small engines shop for quite some time.) and I've found the most common answer would be a head gasket problem, or even more serious, a cracked block, causing coolant in small amounts to leak into the cylinders. I figured that would be the answer I would find but I like to do some research before I go prodding at my car.

The exhaust is white, not grey, not blue, not black. A nice pure white color, and obviously comes out thicker and in larger amounts when you give it some gas. Also it smells sweet. Another clue it could be coolant.

Another thing that made me worry was when I replaced the old spark plugs, they looked like they were being run in a really lean engine. Barely any carbon tracks on them, almost clean looking. Which worries me. It could be suggesting that I COULD be burning water (coolant) in my engine. The coolant level in the reservoir does go down but at a pretty small amount.