Hi,
I tuned such car some time ago and was running good on 60lb injectors and 8psi, but since some time they changed some things on the car (new air cleaner, return fuel system), man came for retune and there goes often usually while normal driving or decel this code.
P0104-mass or volume air flow circuit intermittent.
I changed MAF to mine and this same and played with tons of air settings as never, maf is relocated so maybe electrical problem, but for sure maybe someone knows if it can be from tune.
I have proper maf dialed, idle tables, LWFM both and so on, car runs good, except rich at decel (60lb injectors) and occasionaly at idle. I think maybe it's because of this - only think I don't like in this car. I tuned few blown cars and never had such issue.
Log attached, don't look at fuel pressure, it has damaged fuel pump they has to repair.
Thanks.