I would love to know how to fix my cruise control but I really don't know where to start on my 98 Blazer. Any good ideas ?

 

The first step is the diagnosis and listing of symptoms. What is going on?

FYI: The cruise control module that controls the throttle can go bad and need to be replaced. It is a box the is attached to the firewall above where the steering shaft enters the engine compartment. If that is the problem, it is an easy fix. You might even try to find the part at a wrecking yard.