acceleration and RPM problem on nissan versa 1.6L

[kimo707]

hi all i have problem when suddenly i make heavy acceleration even park or drive the rpm dont pass 5000rpm and on drive mode it dont pass 2000rpm even your foot is on the pedal and suddenly it rises normally and do it again on 4000 rpm and in smooth acceleration it appears less than heavy acc , and now this problem appears more clearly when i installed a core air filter blitz it is very nice by the way and improve horsepower and sporty sound but of course this problem dont let me take the lesiure of it , ?? i need your adivce by the way every thing is very well in the car ,but they said it could be the mass air flow sensor but iam not sure or dont know , i cleaned the throttle valve , my spark plugs is good my fuel pump my engine my exhaust and my transmission every thing is good ?