Vibrating gas pedal - preventing future problems

Hi all, i bought a 2012 with 100k miles about a month ago and it's in pretty good shape

When accelerating the gas engine I'm feeling a vibration only in the gas pedal when the acceleration bar is around 30-50%

It's not violent or problematic, i don't think most people would even notice, but it's definitely there. I just want to address small problems before they get expensive

Have you experienced this issue? What would you check first? I searched the board but didn't find any matching results

Thanks, Ray