Yeah... and I'm going to ping @a91what because you've accumulated enough combo that the A9L is no longer the best way to tune it anymore IMO. If you're going to put money into a wideband, you should put money into one that is future compatible with a good tuning system.
So it seems the MAF is bad then... considering it would be $300+ for another and then about $160 for a wideband, what are the thoughts on just picking up a Holly Terminator X which comes with a wideband and then ditching the MAF and MSD ignition?You should have 10,000 ohms or greater on the following:
MAF SIG and MAF RTN
MAF SIG and ground