I had the same problem about 6 months ago. I guess that hose is a common failure. I found the hose to be the cause by spraying carb cleaner on certain areas while monitoring short term fuel trims with the OBD Fusion app on my phone. As soon as I hit that hose with the carb cleaner the STFTs jumped toward zero. I knew I had found the cause. I think this method works better and is easier to do than a smoke test. I don't care if it gets me labeled a heretic.