The wire that is loose, cut off the old connector, strip the ends of wire and put on a new crimp connector. That one wire may very well be loose and cause intermittent issues.
Electricity just follows a path, since the only 2 things you touched was the center lead and the car and the FI, it went through your arms and make a circuit. Go do the same thing and touch some other part of the car and you will have the same shock.
You mentioned the WUR does not work, fix that first and see if your cold running issued improves.
Fix those 2 things and let us know what happens.
I went out and tried messing with the loose wire, it routes to the cabin so I'm guessing it's for the clock or a dashlight or something. It doesn't seem ot importance, but I'll go fix it anyway the moment I have time. I should have a few spare connectors lying around for this job.
On the wire shock issue, now I see what you mean. I did go out and check it again without the plug out and in my hand and I got no shock, so it's probably not related to the ground either. Oh well!
I have noticed that the fuel pump sounds louder than it usually is (the fuel pump is normally pretty loud as well, but you can rarely hear it at idle. I can now). All of this did happen after it was taken out of winter storage, albeit the day I took it out. Maybe there's a clogged fuel filter or somewhere in that neighborhood causing these issues? I've spent a lot of money renewing the ignition system, but I guess that won't hurt it either.
The WUR has never worked since I bought it. The car will always sputter and misfire quite a lot on cold, and if you take your foot off the pedal, it'll stall instantly. I actually recorded the first start after 5 months, I'll post it by the end of this.
I still do feel the issue is ignition related, all things considered. It seems like the car spits out fuel when it misses and it sods quite a lot when it isn't thoroughly hot. It also pops and crackles every time you can hear it misfire on idle (and it sometimes pings if you accelerate).
And here's the interesting thing! You can rev it up to any amount without it misfiring. The engine does vibrate a bit more than the usual at all rpm's, so it's definitely not burning clean, but there's no holes and there's no full misfire after it gets up to operating temperature. It sounds pretty good even. The moment it has to pull itself along, the misfire gets really bad, which again, begins to go away the more you drive it.
This picture was taken after I fired it up after it had cooled down a bit. Temperature gauge still registered but it was just off the bottom.
It's a mix of water and it's very soddy. Didn't smell that bad of fuel, but my guess is that it gets plenty of fuel, it just doesn't ignite it properly causing it to sod it instead. There was no smoke at all, it was all coming in drops of petrol / water. This is beginning to get annoying.
Here's a bit more media on the sound. It really doesn't sound like it's misfiring when you rev it up when it gets up to operating temperature. However the engine still vibrates and shakes a lot more than the usual (it's normally barely vibrates at all).
And a link for the exhaust. If you fullscreen it, you can see all the soddy water / unburnt fuel coming out the exhaust.