2002 Ford Taurus SES 3.0L OHV rough idling?

I've replaced way too many parts on this car. Basically, whenever I shift into drive or keep it in park, the car idles roughly and I'm not sure why anymore. I've gotten the motor mounts replaced along with the spark plugs and wires, DPFE hose, DPFE sensor, ignition coil pack, and the fuel filter was just replaced less than 25k miles ago so I don't believe that's the problem. I even tried using Seafoam which didn't do anything. Before I replaced the coil pack, sometimes when I would press the pedal after a stop it would accelerate Really slowly. Thankfully this has been fixed. Along with that, when I was on the highway and I saw a big hill coming, I'd have to get speed going downhill because whenever the engine tried to accelerate going uphill, it would lose power and not gain speed until it shifted back down. Thankfully, replacing the ignition coil pack solved this problem (So far). My question is, what could be causing this rough idle that I haven't looked at? I don't think it's my catalytic converter, engine, or transmission as I've had them inspected by 2 mechanics and it came back all clear. The only thing they noted was that the car just needed a basic tune-up which I've already done. After I had the DPFE hose and sensor replaced with new parts, it worked well for about 300 miles. Now the rough idle is back and it doesn't show any check engine light codes, any ideas?

2004 ford taurus 3.0L v6 OHV spark plug firing order?

2004 ford taurus 3.0l v6 ohv engine firing order?
I'm very new to the car world for starters, so bear with me. I was wondering what the firing order is for my 2004 Ford Taurus 3.0L-V6 OHV engine? And also, how do i read the firing order? I understand cable one will go to slot one on the coil but where do the spark plug end of the cables go? Ie, does it go in the front of the engine in the middle or right side? Any help is greatly appreciated!

How to remove 1992 Ford Taurus 3.0 transmission mount?

I'm replacing all of the mounts on my sisters old Taurus and I have came across an issue with being able to jack the engine up enough to pull the mount out, This taurus transmission mount has a big metal bracket that wraps around the engine that it bolts on to and then it bolts to the frame, No matter how i jack it up the bracket will just hit the frame and I don't really have clearance enough to slide anything around. The engineers who designed this must have been high or something. How am i supposed to do this?

Can I pour head gasket sealer into my coolant tank?

I have a 2002 Mercury Sable (Ford Taurus) with coolant leaking from the head gasket. There's no actual radiator cap or hose for me to access with the Blue Devil head gasket sealer I have. Will it work if I put it into my coolant tank?

2009 Ford Taurus - Low Voltage?

So, a few days ago we bought a battery from WalMart. When we connected it to the car, the horn started blowing and it caught fire. The fire was in between the battery and engine block. Smoke (that smelled like burned hair) came from the vents and around the radio. It burnt up the voltage regulator in the alternator. We replaced both the battery and alternator and the voltage is still low. It should idle at 12.2, however it idles at 11.13. When it's off, the voltage is 11.748. What could be the problem? We were thinking fusible links or voltage regulator connector, but I'm unsure if this car has those things. Again, the battery and alternator are brand new and, when you test the computer, no codes pop up. We're desperate for help!

Which vehicle is the better?

Volvo wagon
Subaru Legacy Outback
Chevy G20 van
Ford Taurus wagon
S10 Blazer
Jeep Cherokee
Ford Explorer
some mini van

or other?

all for around $2k - $3k on craigslist.

Honest opinions/answers

Added (1). note: if other, must be wagon-style, to carry things. But not a truck.

2001 ford Taurus won't start when its cold out?

Hi, I have a car that I'm having trouble with. For awhile I could get it started in the cold weather just by hooking up a charger and it would start right away. The battery is new and at full. We think its a fuel problem, however the heater in this car doesn't work either. Any suggestions, where do I start with my trouble shooting?
when the weather is warm, the car starts every time.

Added (1). I'm sorry, yes it does turn over.

Do you think I'll have engine damage? Overheating car?

My car overheated as I pulled up to Canadian Tire. They looked at it and said the rods that bring your antifreeze to your radiator is broken (rotted away and eventually snapped when i got rear ended yesterday which i can't do anything about b/c i didn't file it but they were rotting anyways).
I paid 550$ for new rods (they said that was the only visible damage) BUT they warmed me that when your car overheats and you drive with it you can do damage to the engine which to look at costs more then my 99 Ford Taurus.
The guy at the front desk said engine's are pretty tough so it probably didn't do much damage (Prob drove for less than 5 minutes while the gauge showed H, minor smoke when i lifted to hood).
Anyways i paid for the repairs but if the engine is damaged i'm out $550 AND a car… What do you think? How likely is it that there will be engine damage?