Mazda 323 1.8 -98 Jerky when hot
 

Hi, new at this forum and hope I can get some tips what's wrong.

Having a Mazda 323 1.8 -98. When enging is cold it works fine, but when the engine gets hot so it starts to jerk and feels like it is losing power when I gas on.
Any suggestion what i should look at, someone told me it could be air mass meter or temp sensor, any suggestions?