Hello first time posting just trying to get little tuning help. First time tuning a maf car and having issues tuneing idle afr. I have came from the dodge speed density tuning super easy so tuning in the maf transfer function is new to me. Car is a 2001 mustang gt built bottom end stock everything else. Vortech v2 , Walbero 250 pump 42lb injectors and lighting maf. OK I know one thing different then most is my maf is located in a 3.5 pipe rather then 90mm normal housing so I figured I would just scale for smaller pipe. Pipe only 13.5% smaller I think. Now I am tuning with sct prp. I used there blower gt value tune for base tune. I also put in values for injectors and 90mm maf curve, then modified curve 13.5% . Car starts idles then surges to 1k repeatedly afr 10.3 on wideband till warm up then 11.4 after warm up. I data log my maf counts are high like 409 max. Point is do I pull fuel on base tabLe or mod the maf transfer function more?