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When you cleaned up the engine bay (after you bought it I presume)...did you powerwash the engine?? Cause you could have forced water under the spark plug caps. When you reinstall new plugs, make sure to lube (very lightly) the threads of the plugs with some white lithium grease so it form some what of a barrier that water cannot pass.
If you car jerks like that and shoots out white smoke its probably oil or oil+water. If the smoke is blue-ish, then you might have a leaky injector. Either way, I believe the engine will shake like that if one of the cylinders isnt firing correctly since the engine would be out of balance.
-m
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