Car hesitates pulling out from a stop. Keep getting mag sensor code, although I’ve replaced it 3 times and tried everything I know.

But what testing has been performed? "MAF sensor code" - what codes is that? You've even replaced the catalytic converter for this?! A simple diagnostic test by a skilled technician would have certainly saved you money and time. Why don't you seek guidance at a shop near you? www.repairpal.com/repair-shops The cost of a little labor would have saved you so much.