[zeustogo]

With old thermocouple pilot flame would hit thermocouole perfectly and with plenty of flame as I would try to get pilot to stay on. I repeated a full 60 second attempt 5 times in a row. I figured a had a bad thermocouple. Replaced the thermocouple and have the same results. Could it be a bad gas valve and are there any other possibilities anybody can think of?

[zeustogo]

Found the problem. There are two wire terminals located by the thermocouple port which say E.C.O.. Evidently that stands for emergency cut off. I disconnected the devive that was attached there which is the High Temp. Limit Switch and put a jumper across them and finally the pilot light stayed lit. The limit switch only had continuity periodically. I cleaned the terminals with some emery cloth removed the jumper and presto, it's working again.