Been tuning on this carb all weekend. Here is how it is set up right now. It is on an Airgap with 1" Edelbrock wood spacer. Jets Primary - 70 Secondary - 84 Power valve - 8.5 PVRC - .037 Squirters - 31/31 Pink cams on #1 holes HSABs - 31/31 stock IABs - 70/70 stock IFRs - 31/31 stock setup in top of channel Emulsion holes are all empty. All this info is here to save questions, because I want to try to get straight to the problem at hand. Yesterday I measured all the restrictions, then changed the .031 air bleeds to .037 to try to clean up the highway cruise that was dipping into the 11's. That's when the problem started. Now at light cruise (20-50 mph) my AFR goes from 13.4 at idle to 10.0! I tried different primary jets. I changed back to the .031 bleeds. I double checked that the 8.5 power valve was sealing, checked two different ways for blown (it tested good), and then tried another 6.5 power valve, just to be sure. I changed metering block and bowl gaskets. I have NOT adjusted or messed with the accelerator pump arms at any point. I have had this carb apart five times this morning looking for a something I missed. What would cause it to start doing this suddenly, that none of this would fix??