mass air voltage high / low , hot / wire on 1993 Mercedes-Benz 300SE

after driving 2 miles / e-mail
there has ben attemps to repair this @ many shops,
nuetral safty switch, O2 sensor, Now I"m told that the
mass air meeter needs to be replaced, ( $ 780.00 )

Asked by for the 1993 Mercedes-Benz 300SE
even with labor thats expensive.autozone sells the bosch/mass airflow sensor for $348.99 and thats a new one not remanufactured like the cardone ones they sell.very few basic hand tools and you can replace this sensor yourself.