hesitating to accelerate and sometimes there no acceleration at all when im driving..i change the throttle body,maf censor,fuel pump,air filter,battery,sparkflug,even done change oil for engine and transmission.still the problem occur.

i think thats is the normal maintenance of a car..any suggestion regarding the issue??

NAW,changing the throttle body,maf sensor,fuel pump,air filter,battery,spark plugs,even done change oil for engine and transmission would not really be normal maintenance!

what is my next move???