I think you are going to have to get a read with manufacturer specific codes. Some scanners will read the code in some coars and the conversion list to P type codes from manufacturer specific codes is wrong. There is no MAP sensor on a 2.9 non turbo as it has Bosch Motronic 7.01 and that system does...

It might but that is not a plug n play ECM change. The dealer can't install a used one and Xemodex charges $300 plus to clone your info from old one to a used one you supply. I do not trust the code you have to be accurate for the problem.