91 944 S2 Cabrio misfiring during acceleration
I'll go out and have a look at my car to see if I can figure out what these wires are, post a picture of them if you can. You have to re-size down to 40 kb so get a close-up. If you can't do this, you need to repair the frayed wires regardless, so as they say in the Nike ad, "just do it", but I don't think this is related to your problem.
Sorry about being so adamant about the cap, rotor and wires, I'm not trying to be rude, text talk does not come easily to me. It's just that you really can't see cracked or tracked ignition problems. High voltage has a way of jumping to all the wrong places if it has established a path in the past. Also, when you have an ignition problem, too much is put at risk. If the engine is missing, the computer will see oxygen in the exhaust stream and think it's running lean and then add fuel, this melts the catalytic converter and fouls the O2 sensor as well. If the spark plugs haven't been done for awhile, I would do those as part of the process as well.
This has nothing to do with your "no start" problem, but just something to keep in mind, a friend of mine has a '90 S2 and he had a problem with a "miss" at higher rpm, we scratched are heads over this for about 2 years. The problem was finally traced to broken inner valve springs! Turns out it is a very common problem, especially if you drive the car hard. He was a weekend warrior at our local auto cross. We changed the springs without removing the head, you can do this by bringing each piston to TDC while you plumb air or rope into the plug hole to hold the valves up. It is rather difficult to see the broken inner springs, you have to remove the valve cover obviously, but it is very hard to tell that they're broken because you have to peak through the outer spring. Some people have reported finding pieces of valve seals in the oil as it drains out during an oil change, this is a sure sign the inner spring has come apart. If you have a lot of miles on the car, this may be an issue.
I'd come and give you a hand, but I can throw a rock into the Pacific where I'm at, so I guess this will have to do. :-)