Hi,

I own a 94 Sentra which has been running along great till now (has 121K
miles on it). I've recently been having problems with my cruise
control. It works fine at lower speeds (around 30 - 50 mph), but fails
at higher speeds (60 - 80mph - which I where it is needed...). I can
feel the cruise control trying to accelerate, but it fails and the car
steadily slows down to around 50mph and then it maintains that speed.
My guess is that it's a problem of a leaky diaphragm in the cruise
control system. And the mechanic gave me an estimate of around $150 -
$300 to fix it depending on whether I wanted a new or used Cruise
control box. Anybody have any other thoughts or less expensive
solutions?

Thank you.
Thiaga