Thanks for the replies. I removed #5 injector, inspected the copper sealing washer and the o rings. Nothing abnormal here. I then tested the injector by hooking up a vacuum guage with a hose that would just slide over the injector tip snugly. If the Injector is good, it will hold vacuum. Wola, it wouldn't hold vacuum and you could see it suck fuel from the fuel ports to the tip. In other words, the injector is open to the fuel passages. So now I have to replace the injector to cure the problem.
Many thanks for the replies.