Other Fuel System Hoses Lines/piping, And Fittings problems of the 1999 Volvo V70

I bought this Volvo used w/ 120k miles. I saw records of major work done at the dealer just previous to 100,000 and figured it would be good for another 100k. At 131k, it began constantly stalling and lunging. I did a tiny bit of research and learned of the recall. I took it to the dealer and they tried to charge me 200 to do nothing other than read the codes and tell me the etm software had already been updated, and that the mass airflow sensor was bad. I replaced the mafs to no change.