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How long do plugs, wires, and distributer cap last

(1999 Chevrolet Tahoe)
in New Milford, CT on October 10, 2010
copmuter states mutilple miss fire. wires, cap and one plug changed by dealer 2 years ago, aprox 10,000 miles ago. When enginge is under a load the check engine light flasshes and stays on. Three starts later light goes off. Problem happens on steep hill or long hill, on the highway on a incline.
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Popular Answer
I would check fuel pressure as well as your tune up parts.
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