I'm not bashing Cobb at all i think they are a great company but these OTC maps are hella lean , the best thing to combat LTFT is to make sure your BOV lines are tight and secure, as well as boost tube clamps and if you're running a FMIC ( Check welds to make sure there's no cracks in it) , as a spike in LTFT's could be a positive indicator , however making sure your MAF is Calibrated correctly is key as well, as many people have said before i believe this MAF has 5 points that it reads, Also check your MAF Voltage it should be 2.34-3.00 or there abouts, Also once you have set your MAF then you should be able to nail down the Actual AFR, i had my car tuned with a test pipe and MSCBE, MSCAI, and that's all that was done besides CAM phasing... just be aware that spending time with this unit isn't a tune on the fly like COBB says it does which it doesnt, you have to swap devices back and forth and make sure the tunning place knows that since i would take it they charge you by the hour...