I own a 1998 honda accord V6 , 120k miles whenever i'm accelerating on the gas pedal..it just doesnt' feel smooth ..It feels very stiff and my leg hurts ..I tried cleaning out my throttle body, but there was not much carbon build up. I test drove the 2007 camry 4 cyl, and they have a much smoother feel and acceleration..Anyone know why this could be happening?

 

Something is binding.

Check the pedal hinge and actuator cable action. You may have a binding cable. If you move the throttle plate by hand, you should be able to feel if the throttle plate is binding. It has a stiff spring, but should turn smoothly. If you disconnect the throttle cable from the throttle plate linkage, you can check the cable action w/help from a partner to see if there is binding in the cable.

good luck