I have had my 1999 F-150 5.4 in for rough idle 3 times and still I am told this is normal. BULL S&*% I even put a glass of water in my console to show the service tech how the water spills out at idle. If you are expereancing a rough idle report it to NHTSA service bulletin database. call 888-327-4236. They will take your complaint and and log it for possible RECALL for this problem.PASS the word to all 5.4 owners who are expereancing this rough idle. O ya keep taking your truck back to service at least once a month until they get tired of us and finally take care of this annoying problem......