The accelerator squeaks and has become hard to press. Reported to feel as though it "sticks".
accelerator squeaks on 1998 Isuzu Trooper
Probably your throttle cable is failing, About $65 at the dealer or $43 at http://www.parts.com/ put in your year, make and model then put throttle in the search box and the labor to change it is about a half an hour. This looks to be a dealer only item.