EGR passage restricted? I wouldn't think the EGR passages would have enough pressure to blow the plug out of the end...but I guess it's possible.
For the springs....tried the dealer or an online parts dealer? If you are looking for brand new, then those are probably your only options. If you are just needing some good used springs, then salvage yards, private individuals, etc. IIRC, 2wd springs are a little softer/lighter than 4wd springs, so you could get some 4x4 springs and they should be firmer and probably lift it just a little. Make sure you get 4 door springs, since the 2 door springs are not the same as 4 door springs.