Both the orginal and new plugs are gaped correctly and look about the same as far as condition. The older one seem to be working better, because the engine is running much smother. It may be possible that one of the new plugs were defected. I purchased them online through "Autoparts Warehouse.com" (FR7KTC), they are the same as the original were.

Other than the power lag I think it is now gone, but the noise which I'm hearing is coming from one of the idler pullys, but I can not idenity which one. Earlier this week, I was thinking that may-be the worn pully would cause some vibration at higher speeds.