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Try retracing your steps. Check everywhere you were touching things, perhaps you accidentally knocked a vacuum hose loose. If the plugs can be adjusted, make sure they're gapped properly. If you have a voltmeter i'd check the resistance of the plug wires to make sure they're ok. Acceptable resistance of the plug wires vary from car to car. But obviously, the lower the better. It may be possible that you got the firing order wrong when you hooked up the wires, here is a site that will give you that order:

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โˆ™ 2006-09-04 02:57:40
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Q: Why would a Ford Mustang run worse after changing the spark plugs and wires?
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