Well I think I fixed this. Waited a while before posting as it had been warm and problem only exhibited when cold, but now it has been cold again. After trying and checking many things with no improvement I decided to take a look at the ignition leads. They only had about 15000 miles on them and I really didn't think they would act up only when cold. I had sprayed water mist all over them with the engine running with no effect. However when I pulled them off three came apart from the collar that snaps over the spark plug. One looked clean and shiny but the other two were black inside from arcing. Replace them with a spare used set on hand until I could get a new better set. Haven't seen any reoccurance of the symptoms since. Still don't understand why it only acted up when cold.