If one injector is clogged, then it is entirely possible that other received similar crap too. You may want to consider replacing all injectors. On my WJ the #4 injector stopped working properly. I had that one done at the dealer, and then #8 started causing issues. I did that one and another one in my garage, and all has been good since then. If anything else happens, I am just going to replace all of them.
Injectors all get their input from the same dirty tank. If one is clogged, odds are that others will have issues.
'06 XK Limited, 5.7L, QD II, Black, 140K
'02 WJ Overland, 4.7L HO, QD, Inferno Red, 110K