Weird hesitation problem on Mazda3 2.3L

[mramstedt]

Hi there!

I have had some hesitation on my Mazda3 2004 for some months now. It is worst around 2000rpm pressing slightly on the gas pedal, the engine feels to die. If I step on it, it will pick up, if I just let is roll for a while, it gets over it.

What could be the problem?

 

[tsunami]

do you have any modifications?? does it only do it when you touch the gas??