Is it the # 7 and #5 injectors? Those are prone to clogging more than others...I think. I would go check your fuel filters again first. Once you get those clean, purge your fuel rails with the Schrader valve, disconnect fuel lines, pop off the rails, and then the injectors. Soak the rails and injectors in a warm contact cleaning solution for a while. Every 10-15 minutes, take them out and lightly tap on them... Then after an hour of solid soak time, take them into the sink and flush with warm/hot water..and even reverse flush them. Once they are clean (and if you are brave enough), blow on them and try to see if you can get them to whistle. If you can get a constant whistle pitch, then they are clean. Try and swab the rails as best as you can--and get the rail nipples with a Q-tip... Hehe...I said nipple...