^^ its actually the hard line with the rubber line that wont disconnect

, i haven't driven my car since that day and i actually felt bad for the guy, so me and my coworker tried again to get that line off and well no luck, and well heres the deal..
i started to loosen the nut and it started to get loose and looser until it got hard and then all of a sudden loose again. So.... were thinking that the lines got crossed threaded

. but was able to retighten with out a problem.
so the only opinons would be to replace the hard line and when doing so install the last line, and well i dont have another one, except take it to the ford dealer next to work and have them give it a try but i know that is going to be expensive even with employee discount.
And just one question can i drive my car with the 3 S.S. lines and one rubber stock line

, with out causing some damage???