2005 Nissan Murano service campain repair

Hi, My sister owns a 05/Murano. With only 34,483 miles. She was complaining about the veh. Surgeing & jurking on accel. Mostlly cold. & Seemed like the veh wanted to dy out at stops so she'd put in nutral. I drove the car. & Finnaly it did it on me. & She was right it surged preity badly. I happen to work for Toyota servece. But really had no clue on Nissians. Our computors are differant so I could'nt even try & pull up codes. Anyway I told her to bite the bullit & spend a $100.00 to get it diagnoised. She did. Nissan told her that there where three differant service camp. That have not been proformed. The major one was a max air flow meter. Than they added that becaused the meter was bad It caused the air flow sensor to burn up & it to needed to be replaced. & That would NOT be coverd by warranty & she would have to pay for it!
She asked me what to do, I did'nt think that sounded right. If a covered parts failed & caused another part to go bad that should be coverd aslo. Thats how Toyota would of handled it. Needless to say, the adviser offered to giver her the number for Nissan to see if they would assist. & Replyed that everyone else that calls for assistance gets turned down. But she could try if she wanted to.
They charged $378. For the parts & charge + over $300.00 labor to replace this burned out sensor. They also have her a shopping list of recomondations totalling $4800.00. I wont get into those items this lettle is already long anough. I told her to ask for the old parts. But of course she forgot. She paid the bill & almost $700.00 later the car runs fin now. I just need some pice of mind. Should it have been covered The car is under 5 years & 36,000 miles.
but alot of things are covered for 5 years. I red some blogs on line about that dealer & all but one was very negitive. Mostlystate, customers beware! Any words to the unwise & we would be very thankful for. Thanks again. & Sorry this is so long.