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Move your seat all the way back and look at the top part of your gas petal.  You'll need a flashlight for this.  Now, move the gas petal up. (opposite direction of when you mash it down to accelerate) You'll see a cable with a spring on the outside part of the upper part of the gas petal.  Pull the cable toward you. 
Now, if there's a gap between the spring and the gas petal, this is where you'll want to put the zip-ties.  What you're going to do is wrap the zip-ties tightly around the bare cable.  This will take up the slack in the throttle cable.  I was able to fit three zip-ties in mine.  
Now that you've read this, go under your truck and take a looksie.