As far as your rough idle is concerned, you symptoms are exactly like mine, even the economy gauge is behaving the same way. All my electrics are changed, wires, plugs, cap, rotor etc. The diagnosis that the tech gave me is: my car has K-injection, or contiunous injection, one or two of my fuel injectors is either spraying to much or or not enough fuel, hence the rough idle. So instead of just replacing the fualty ones I am getting new injectors installed in a few days and the fuel distributer cleaned.

As far as your turn signal, I had the same problem, I changed my corner lights with some I got on ebay, the corner lights came with new bulb holders also, so I changed everything. The signals worked fine for a while until recently the left one began to malfunction. I thought it was the hazard swith but it wasn't, so I changed the bulb holder to the old one and voila!!!! No you did some soldering so you case is slightly different, but that info my help.

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**A few Hondas etc... etc... Not Worth Mentioning**
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91 300e (Just 200k with Ease.)Best car ever ???(Sold)
90 420sel (Black with Tan Interior) Best car ever!!!!!!!