common problem here....wishbone bolt seized........you need to heat it up...but you cant bc there is a rubber bushing there that would melt. then you would need a new control arm or poly bushings. your best bet is to take a "wizzer/grinder" and cut off right next to the bushing. then drop the control arm...then drill out the bolt/stud. it is a pian yes...especially when you are doing it in your driveway or whatnot.
so...either poly bushings or cutting....you choose...good luck