I appreciate the thoughts. I have had a bad Cat before and this doesn't act anything like that did.

Vacuum leak would really only apply at idle. Once I was able to get engine about Idle RPM, then it should run even with a vacuum leak, all though it might run rough. During the few times I could get the engine to rev to say 3000-4000 RPM, it was smooth and not missing, then just like that, instant shut off, just like I turned the Ignitiion switch off.

The engine shuts as quick as I can snap my fingers. It doesnt struggle or starve. It is like something is limiting the fuel supply, then like some sort of an electrical device is shutting off the fuel supply instantly.

As I mentioned, I could get it to run if I disconnected the EHA Electrical Plug, then it runs very rough, but I am able to rev up the engine and keeping it running for a bit. The only change the EHA would make is fuel and it makes a dramatic difference when unplugged.

I just don't know what the symptoms of a failed EHA are?????

Thanks,

Sean