One thing to look at for the low end power issue, is there any oil in the plug wells when you pull off the plug wire? If there is, your plug wire might be destroyed due to the oil, along with your plugs. In which case they will need to be replaced. If this is the case, you should also replace your plug well seals, and since you say it seems to be neglected, this could very well be the case. Also, as they said, the MAF might be dirty, in which case you could take the sensor out and clean it off with electrical contact cleaner and let it dry off and try it then. You can also talk to some guys at
www.shoforum.com, because they also have a lot of guys who have procedures with pictures for doing these things. Also, with reguards to the smoke coming from under the hood, did you happen to try and smell the smoke, because it could be a crack in your exhaust manifold, if it smells like exhaust. If it is white, then it could be your radiator leaking on to your engine from a small crack or something, because I had that problem with mine. It took awhile for the fluid to be low, like a couple of weeks, then I would see that my resovoir was almost empty, when it was full before, and the radiator was a little low. But Despite the issues, I do wish you Best of luck with the SHO

. Also, welcome to the TCCA!