I got my smoke machine today. I wish I had always had one of these, it is so cool. Didn't find any vacuum leaks but did find a couple exhaust leaks, one right above the O2 sensor, so that is probably my lean bank one code. I put ultra high heat silicone on the joints and will recheck with smoke again tomorrow. These new fangled cars with O2 sensors don't tolerate exhaust leaks like the ole carb did.