When was the last time you did a tune up? New plugs, wires, PCV valve and a fuel filter could go a long way towards smoothing out your idle. Running a can of seafoam through the engine couldn't hurt either. If you're replacing spark plug wires, go with something better built that the stock Motorcraft units. I got my Taylor Thundervolt 50's at summit for around $100. You can even get them in pretty colours.
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