300 max 1003 measured HC 3.00 max .16 measured CO If this is right(I copied pasted)It almost looks like a lean miss. With no cats I would expect CO a little higher(maybe 1-2%)1000 HC is a misfire almost for sure. Absolutely sure there's no vac leak? How about a cylinder power balance to make they're all firing? I know you said it runs smooth but 1000 HC is real high cats or no cats!! Just throwing ideas out.
