After having my tuner look at a log file from my 08 5.3 because of the p0420 code, he says that my MAF is over reporting by 4-5%. What could I check to see why this is happening? i'm running stock air box/filter, straight intake tube, dynatech headers with their cats. Would this cause me to run a little rich?
I haven't heard back from my tuner in a couple of days which is the reason I am posting here. I'm still in the learning mode.
thanks,
Larry