bigblue91601

So I have this 93 jeep grand with the v8, it has about 220,000 miles, unsure of the exact amount, it had some old and warn vacuum lines, so I went ahead and replaced them thinking that this might help my low idle but as you can see from the picture, still idling low but not idling rough, if you see the black and grey picture, you'll see an intake manifold, to the left of the gentlemans left hand right under the thicker black hose you'll notice a small outlet where a vacuum hose connects to, when I connected the vacuum hose to it, my jeep started up and idled very rough, once I took the vacuum hose off it idle low but it was still running fine, later on at night I put the hose back on and I turned on ran rough for a bit but then adjusted itself, not sure why this happened or why my jeep is still idling rough please help!!!