Losing power going uphill
 

Hi.. it's my first time here to wrote my concern about my Mazda 3 1.6 L 2006 model.
i bought it last year Dec. 2016(2nd hand) I been using it for 3 months and it looks so fine.
until one day when i was driving suddenly it loose powereven i press hard the gas peddal it wont work. So i bring it on my trusted mechanic and told him what happen. then he suggest to change the ATF fluid and clean the transmission after that my car runs okay like it was before.. then one time i'm heading to a place with moderate uphill terrain it happen again my speed drop to 20 from 80 (i'm not fully loaded) but my car seems getting hard time to pass on that road, but its run normally on level road. Can anyone give me idea how it was before i bring it for repair.

thanks a lot.

Welcome aboard.


And CEL activity?