Just recently i've noticed my accelerator pedal isn't sending my car the way it used to. usually while driving, i'll push down a little harder just to check the sound of things and lately i've been doing the same check but having to push a bit harder, it doesn't seem like much of a problem in words, but its killing me knowing its not riding the same. it just won't push as hard anymore. i confess to having a small oil leak off and on that i just haven't had the time to bring the car in for (work, school, etc.). could this be the defect of the leak?

i've checked my oil, perfectly fine.