We bought a house that we knew had a foundation that had sunk, an engineers report stated the house was done settling.
We have priced out to fix it but it's going to be way to much. 1) does anyone have ideas how to DIY this fix. 2) if we don't fix it, how do we level the house inside for the areas that are uneven. And 3) I want lay a subfloor in the basement (2") do I put insulation and plastic underneath?
If you want a serious response to what is likely a difficult problem, you are going to need to carefully, thoroughly and accurately describe your foundation problem. This will include a description of the soil type, groundwater depth, photos of the damage, a description of the framing in the house, and a scaled diagram of your house. The quality of response will be directly proportional to the quality of information you supply. As for DIY to fix, that will depend on the solution you select, and your personal capabilities. Foundation repairs are generally difficult, often require specialized equipment and expertise, and are often more expensive than you would like.
I generally fix anything that comes my way (though sometimes less than ideally) but a settled house is out of the domain of DIY. You have a very serious problem, more than likely. Sorry to hear about it, but why, pray thee tell, did you buy it? Just too good of a deal to pass up?