GMC 1994 Sonoma Owner's Manual page 88

To lncrease Speed While Using Cruise Control
There are two ways to go to a higher speed. Here's the first:
Use the accelerator pedal to get to the higher speed. Push the button at
the end of the lever, then release the button and the accelerator pedal.
You'll now cruise at the higher speed.
Here's the second
:
Move the Cruise switch from ON to IUA (Resume/Accelerate). Hold it
there until you get up to the speed you want, and then release the
switch.
To increase your speed in very small amounts, move the switch to IUA
(Resume/Accelerate). Each time you do this, your vehicle will go about
I mph (1.6 km/h) faster.
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