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Check the RepairPal estimator for your car--there should be Shock/Strut Replacement to give you an idea of how much labor is. Most shops won't install a part that a customer brings in, however. It exposes to liability and warranty issues.
I would start with the parts department/store. Motor mounts are pretty complicated in most cases--often times even professionals will need to see the parts before they know which is which and where they go.
Take a look at the RepairPal estimator for replacement costs. And take a look at the common problems. These vans can be severe problem vehicles--be careful what you buy.
What does this mean? You maintenance schedule can be found in RepairPal's estimator: http://repairpal.com/estimator
This is a hugely complicated enterprise, and you need the assistance of someone who really knows what he or she is doing to work through this with you.
Here is very detail information on this code: http://repairpal.com/OBD-II-Code-P0172-and-P0175
If you've never done this before, then you need to invest in a repair manual with step-by-step instructions and diagrams. You can get access to one online for cheap: http://bit.ly/mitchell_repair_manuals_online This can be tricky and sometimes requires special tools, so you will likely be better off taking it to a shop. It won't be THAT expensive.
Chevron has a fuel system additive called Techron Concentrate Plus. The formula with the "Plus" is specifically designed to help with this very common GM problem--it's caused by corrosion on the fuel sending unit in the gas tank. If a couple of tanks with the Techron Concentrate doesn't work, then you are probably out a bundle for the fuel sending unit.
The dealership will have Recalls relevant to your vehicle searchable your VIN. Not all Focus are necessarily affected by each Recall campaign number. Your recourse is to ask the deal what Recalls have been issued for your VIN. If you are uncomfortable with they way they are treating you, then I would call Ford itself and ask them about your vehicle. Your state may also have an auto repair consumer protection arm, as in California with the Bureau of Auto Repair.
This is strange behavior and a serious safety issue. I strongly recommend you take the car to a professional for thorough diagnosis and repair.