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To begin with, is your "check engine (CE)" light on? If it was on and now its not, you need to replace the bulb. If CE lights is on, find out the codes before doing anything. If bulb is good and "CE" does not come on, begin with: (1) gapping spark plugs, (2) replace spark plug wires (if haven't changed them within the last 2), then the coil. If your Cinco is still idles rough, adjust gas pedal until idling smoothly. If this still doesn't help, replace your two oxygen sensors. If still running rough, the converter. After doing all this and problem is still present, take it to a mechanic you trust.
Nephew had similar problem on different vehicle - had spark to plugs, limited gas, everthing else checked. I did one thing first - check for two fuel filters - one in the tank was only screens and one in the line itself. Found a little in line filter just outside of engine compartment under car next to frame that looked like it had never been changed - partially clogged - replaced it.Almost ran but would not keep running. I had rotor and cap pulled - found that the screw holding rotor in place was loose. The rotor edge next to plug wire leads was chopped up and the cap's plug wire leads were heavily oxidized. Replaced them and got it running but a little rough. Pulled the spark plugs and found gaps from 25 - 100 ---replaced the plugs with correct gapping and it ran really well.
Assuming that the alternator was bad, preventing the battery from fully charging and the mechanic got it right. However the replacing the "Harmonic Balancer" makes no sense as the "Balancer" only smooths out the tendency of the engine to vibrate. See: http://www.youtube.com/watch?v=Ex_yJ_V5UH8 As to it running rough check the spark plug wires as these on older cars tend to break the carbon path in the center of the plug wires thus loosing spark to a plug from time to time. Start the engine at night when it is dark and look under the hood at the plug wires to see if you have any arcing. Replacing the plug wires cost a little less than 20 bucks.
Did you replace the wires? if not you may have broken a couple of wires. Not sure what fire wire is unless you mean the spark plug wires. Also did it do this before you replaced the plugs? need to know.
Do not dress the spark plug wires to make them look pretty. The spark plug wires on must cross each other at right angles every place they cross. They cannot be run side by side, or the engine will crossfire.
could be a wire crossed, or it's out of time. since you used motorcraft plugs, did you set them properly to the correct gap? replacing plugs without gapping them can cause the sluggishness, out of time can cause the mis-fires and rough running.