Y07_A66:

How did you isolate your fuel pump problem? Flow test?

I also had a chance to tinker today. I went from .036 to .037 IFR, which helped improve the low speed behavior. However, I discovered that some instances of my lean miss (AFR>17) are when pressing a little on the throttle. Vaccum is dropping to the 12-10" range, and I suspect the main are starting to flow at this point. My conclusion is that the 69 pri jets are way too lean, and I don't think further increasing the IFR is going to help under this condition. The motor was running well enough that I decided to take a quick highway run, and to add insult a WOT from 60MPH started with AFR in the 12's but then I watched as it dropped into the 11's then into the high 10's! This was from about 3K to 4.2K in high gear. Obviously my HSABs are also too small. So I have to go back up in size on both the pri jet and the HSAB.