The plug wires. Wow. My car was having hiccups at idle, so I ordered some NGK's and MSD plug wires. I just got the wires and installed them today (haha installed like it took more effort than opening a soda can) and I have to say my car has never ran so smooth even at day 1 with 4 miles on it. I havn't even gotten the new plugs to put in yet. In summary:

If you don't have MSD SC Plug wires. Get them now.

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Hmm edit was pooping out on me so I'll add this here. After seeing how dirty it was under the hood I had to clean it. Bleh it's been snowing and rainy and cold here all week and this is the first nice day in.. well awhile.

 

That is why I alway highly recommend the MSD Super Conductor plug wires as one of the, if not the first thing to do or change. That and adding an OCC into the PCV line.