So far the new problems that I've encountered this winter:
I may or may not have damaged/disconnected/shorted a wire leading to one of my taillights (so now it doesn't work).
I also found out that my doors freeze closed as well as the driver side lock.
The car jitters on startup in extremely cold temperatures.
There is a banging noise coming from somewhere in the back, which may or may not be a problem.
Problems that still exist and still need to be addressed:
My brake lines are still not done.
My fuel filter is still not done.
I need to checkup on my carpet for water damage.
The engine idling issue is still completely unknown and an ever-present constant hassle.
The "Check Engine" light occasionally comes on and off, but it's usually off. It's something fuel related, maybe even just a sensor.
The left front brake occasionally moans like a horny humpback whale.
The car vibrates tremendously during heavy acceleration.
The ceiling fabric is still hanging in front of the back window.
I lost a bolt when disassembling the dashboard so now my glove box rattles a bit (the bolt is somewhere in the car).
There is still a popping noise coming from the left front wheel when steering while driving. Suspension has been professionally checked with no diagnosed problem.
Oh and by the way, my car died and was having tons of trouble on Thursday. I drove over to my community college to ask my advisor a question and to rent my college books, but completely underestimated how much time that was going to take. I knew it wouldn't take long though, so I just left the car running while I went inside so I wouldn't have to fight it when trying to leave. I came back out too late though. Letting the car idle for long periods of time (e.g. parking lots, drive thrus, traffic jams, etc) also makes it act up.
As soon as I shifted into reverse, the RPM plunged downwards so I quickly gave it gas and brakes simultaneously. I backed out of the parking space and the car died in the middle of the parking lot. I started it like 5 times but couldn't manage to get it to hold an idle at all, which was odd because I'm 95% of the time able to get it working. I started the car, bumped it into drive, and then squealed my tires in a desperate effort to get it accelerated enough to hold the idle for a few seconds as well as get out of the way. I raced around the back of the lot where there were no cars at all and then the car died right in front of the athletics center, which was thankfully closed. I flipped on my hazards and shut the car off. I popped the hood, let it cool for a few minutes, and then managed to get it to a bumpy idle. My only hope at getting home was to get the car to a place where it can drive fast, as that somehow "cures" the engine. I two-footed my way through the stop signs to escape the campus and onto the frontage road next to the highway. I got through more stop signs and got onto the highway where I had about three miles before the stoplight. I drove at 70mph for that period of time and was fine from there.