Toyota corolla model 2003 showing power loss at times specially on hills why on 2003 Toyota Corolla

it was bought only recently but it was a used one; oil both motor and transmission has been changed recently but when i drive it specially when the driving is on hills or mountainous areas even though i press the accelerator pedal to the last position it would not move beyond 40km/hr but on level roads I tested it and it can move beyond 110km/hr so how could i fix the problem what parts should i get checked by the mechanics or technicians I would appreciate for your cooperation in advance

by in Garnet Valley, PA on August 09, 2013
2 answers 3 comments
ANSWER by on August 09, 2013
get a diag and est as you think.have them scan for codes and post so we can adv
COMMENT by on August 09, 2013
WHICH DIAGRAM
COMMENT by on August 09, 2013
get diagnoises from your mech
ANSWER by on August 09, 2013
scan test for codes and check fuel pressure
COMMENT by on August 12, 2013
what else should I do and will u help me by sending me the corolla repair and maintenance manual book or tell me here I can get it easily

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