I know that no one is replying to this thread, but I think I'll keep updating it in case someone wants to join in.

I just went out to the truck on my lunch hour and found out spark plugs three and four on the right side (compression side) of the engine were switched around. My question is this: Could incorrect wiring have damaged the coil pack?

As a side note, I used the recommended Motorcraft spark plugs when I replaced them, but I did not use the Motorcraft spark plug wires when the originals were taken off. Would it be a good idea to purchase the Motorcraft set? I plan on checking the plugs and such when I get off of work tonight.

Another possibility: I remember my neighbor telling me that he adjusted the idle to make it easier for me to take off from a stop since this is my first time driving a manual. Is it possible that this is the source of the problems?

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1994 Ford Ranger XLT
2.3L 4-cylinder 5-speed
Two-wheel drive
Regular cab w/ long bed
158,xxx miles when purchased