" have I lost a bearing that is causing the crank to wobble and an exhaust valve to remain open? Is it just a valve sticking?"
If you lost a bearing that caused the crank to wobble, that engine would continue to run for about 2 seconds.
And valves don't stick open after the engine heats up.
" Have good fuel and spark is good cold and coil is new."
That's probably not the case.
Did you check for fuel and spark as soon as it started to stumble? Not five minutes later, but immediately?
Tell us exactly how you checked for fuel & spark.
It's easy to over-think these problems......90% of them turn out to be simple fuel or spark issues.