We have this vehicle and it is constintly running rich.

So far we have not been able to get any codes out of it.

Recently I replaced the front O2 senser to try to correct this problem. But that wasn't successful. I really hate just throwing parts at it and was hoping someone else might have any suggestions.

if you have an air leak in your exhaust (i.e. blowing) the oxy sensor will pick this up and add fuel if not a computer might help as its efi