Q: no throttle on 2002 GMC Yukon XL Denali

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What does no throttle response mean; and what does it indicate that the problem could be related to?
(1) Answer
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ok......if a throttle response is the ability of the engine to respond to your input from the gas pedal, what causes this? It is a symptom of some greater problem or problems right? What is a possible direction a mechanic may be guided? Or in otherwords, can you give me a long answer like you gave with the "no crank" question. That one was extremely helpful and it was not vague in understanding. It answered well enough for a judge to make a good decision on that basis.... =)