You can also check compression and/or injector health by removing the cover and, during idle, push with a large screwdriver on the injector, if nothing changes, you have a problem there., simple and easy DIY check-up...
Sounds like it's getting blown out one of the valves from the lifter valley. Bad valve guide sounds like.
I will definitely give it a try. Have been out of town lately and now back on the boat. Thanks. Will keep you posted.