i replaced maf on my nissan sentra 2015 lights still on?

my hubby cleaned my sensor first and that worked
for awhile soi finally purchased a brand new one
and replaced air filter as well but car continues to
do the same..Rpms while at a steep incline will go
up and down and lose power immedietely..i bought  
extended warranty but really cant afford to take it
in and i have only 300 miles till extended warranty
is void..so frustrated any ideas of what it can
be..im not sure what my warranty covers but with
my luck it wont cover it