hey everyone i hope someone can help me. i have a 98 chevy k3500
4x4 auto tranny 6.5 turbo diesel. my engine speeded up all of a sudden
for no reason. i got home and a light on the dash came on that said
service throttle soon. do i replace accelerator pedal module or
throttle position sensor. where is the throttle position sensor located.

thanks for any help

steve n.carolina