WANT TO PUT NEW COUPLING ON FUEL RAIL LINE--HOSE DOES NOT WANT TO COME OFF-

Ij BOUGHT COMPLETE NEW REPLACEMENT COUPLING--PIC IS OF OLD COUPLING--i JUST YANK THAT FUEL LINE OFF AND PUT IT ON NEW PIECE? NEW PIECE DOES NOT HAVE BLACK SLEEVE THING ON IT LIKE THE ONE IN THE PIC DOES--DO I NEED IT ON NEW FITTING?

Car running very bad checking for vacuum leak noticed fuel line connector at fuel rail hissing noise-took fitting off at the top where it joins the fuel rail with a tool I bought at autozone.-(Spring inside coupling looks kindof lopsided-stretched)-old car, decided to replace the coupling. Are you sure that black cover is not part of hose? We keep pulling on it and it stretches and hose won't turn loose. Should I cut hose? It is long enough to cut and put back on fitting. I found a vacuum line, very small, under that fuel line--- thought it was a wire until I saw that it went same place other vacuum lines went. Haven;t checked it--didnt see it until took fitting off---could it have been doing hissing and causing that much bad engine performance? I think I will replace it anyway.

What else would make it idle rough as a threshing machines every tiem you step on gas--when I let off, it smooths down a lot--roars when I give it gas--shudders, etc. I can drive it but it doesnt like to go uphill. So frustrating I just know it was leaky fuel fitting. 37.00 for that boo boo ----will drown, vacuum lines now that I have found some of them---stupid diagram on hood, diagram from manual no good for me it is just straight lines--and initials of parts I am a dummy or I wouldn't be asking all these fool questions with soapy water maybe get somewhere I just dont have 200.00 to get shop to fix it

IJ put in new plugs, wires, pcv valve, air filter- water pump timing chain belt accessory belt doesn't use oil, trans good- starts right up - just doesn't run worth a dime after that- it was idling kinda rough reason I did these things--except water pump was leakingput on new starter relay, cooling fan relay, surelly do appreciate your bearing with me. When I get my check next month will make donation if car doesn't break me again. I am on ssi check-

Ijt is a 1.9 escort lx with one overhead cam, two metal lines going into fuel rail, these lines are short and take the spring coupling to hook onto hoses, one goes to tank, other goes to inline fuel fileter as far as I can see I am putting new spring and o rings onto old fitting and putting it back into fuel rail fitting. Will start car and check the vacuum line directly beneath these metal lines--might be causing hissing noise? I'll see directly. A month ago I knew nothing abut this engine. Had s10 pickup before. Easy to work on. I have learned a lot about this sideways pos. Enough to wish I still had s10.

Put soapy water on vacuum line that was hiding inder 2 metal fuel lines coming off the fuel rail engine changed its tune a bit---other end of same line was bubbling a bit. Of course it is special piece that cant be bought for my old car--am going to seal fitting on it with silicone and put teflon tape on connecting nipple---let you know how it works out----I have diagram and directions on how to use code box. I found the thing yesterday. Will try it is vacuum line doesn't do trick. Have a better day shirley