How to manually delete a user installed source/repository from cydia that doesnt show up in the source list.
(Jailbroken Iphones only)
Download IphoneBrowser
Install it and plug in your iphone to your computer
browse to /private/etc/apt/sources.list.d directory on your iPhone or iPod touch.
Find the repo named cydia.list and right click it.
Click Save as and select a location on your computer
Open the file with notepad
find the source that was added that doesnt show up in cydia's sources list
delete "deb http://brokensource/ ./"
save the file
copy it back into /private/etc/apt/sources.list.d directory on your iPhone or iPod touch.
This is good for deleting manual entered sources that were mistakes or mistyped sources