update: fuel pressure is fine, although fuel volume is hard to check and considering the size motor and needs.. volume was not my first thought. we sprayed a few cans of cleaner around the intake and under hood hoses and no change in anything. there are no exhaust leaks anywhere, and all is tight.
No, I have not change the fuel filter, but will do that in the morning.
I do not know what a 'smoke test is", but if I am told I will try it.
the computer has been cleared and re-examined several times.
thanks to all. I will not give up if you don't