The accelerator pedal is really hard to push...I checked the cable and pedal spring, both are ok...The part the cable hooks onto on the throttle body is really hard to push...should I replace this part? If so, is there anything I need to know to replace it?

 

Remove the throttle body and clean it, they can get real dirty and that can and will make the throttle stick.

 

Theres olny two tools needed in life. WD-40 and Ducttape. if it moves and shouldn't use the ductape, if it's supposed to move and doesn't use the WD-40. Sorry Couldn't help it. Quote from someones Sig.