Unable to get fuel tank vacuum? Try the easiest thing first, look at the gas-cap and where it seals to the filler pipe; look for a torn/cut seal, rusty pits on the metal seat, etc. The cap is stock, on there, and tight, right?
Good call on that gas cap Bill! Your learning!! I have seen alot of these 1450 problems dealt with a new filler neck. They tend rust in my region. A seeping filler tube will also give a symptom like a loose gas cap.