Question about 2001 GMC Savana

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2 001 savana van

I have a 2001 GMC savana van and it's running a little sluggish. Check engine light is on, thought it was bad injectors so cleaned them. ran a little better but still hesitates. went to local auto store yesterday and they hooked up to computer error code states misfire on # 8. suggested i change plugs and wires but can not even see wires / plugs from under hood. any suggestions

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