I've been out of town again the past couple of weeks but did do the compression test last night. The number 2 and 3 cylinders are less than 10 psi (1 and 4 were at 135 to 150)so I must have a valve or ring issue. I'll be pulling the head this weekend unless anyone has any other tests or areas to look at that are less invasive but I think this pretty much narrows the problem down.

Thanks again for all the suggestions.

Randy