A couple of things I should have mentioned previously. It is a typical 350-TBI set up, I think this was the first year for it. It doesn't seem to have any miss or stumble which I attribute to the Jacobs ignition system which has been on for some years (it used to miss a lot at idle and stumble rolling off idle). It does seem to idle a little high but it always has. It has 170K miles and the original CAT, original injectors, and the original heads and engine internals. Don't start throwing stones all at once. :-{
I mentioned that I changed the EGR valve recently when troubleshooting a rough idle which turned out to be a vacumn leak. How would I check for an "over active EGR valve"?
How did you make the calculation of the air/fuel ratio? Could you please expain for us mortals?
Ken K