[IROCdan330]

i feel bad seeing you go through this man...sucks when its on the internet because all we can really say is "try this part." Throwing parts at it generally will fix the problem eventually but only after a good bit of money is spent, unless you get really lucky and get it on the first or second shot. New defective parts suck, too, because you have it dead set in your head that "i just replaced that part, it cant be bad." I have gone through it a bunch of times.

If you hit water and it started acting funny...i would think maybe there is a hairline crack in something that you cant see and its allowing water in, causing the spark to find its way to another cylinder, path of least resistance...

As far as the rich smell, I wouldnt condemn the plugs so quickly...these cars generally have an ignition that could clean a plug off relatively fast if everything is working up to par...depending on quality of said plug and all...
If i recall you dont have cats, and you are taking a lot more air into the engine than before...and on a stock tune it may run a little more fat...next time you scan it check out the Block learn multiplier values (aka long term fuel trim) and see where its at...