2000 Z71 square - engine sputter?

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ASoCalCowboy

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Recently my engine has started to do some sort of spudder after I’ve pushed it a little on the freeway or give a punch with the a/c on. Acts as if there is a misfire... I’ve replaced the #3 spark plug several times. Engine has 208,000 miles on it. Any suggestions?
 

M1Gunner

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Why have you changed #3 spark plug? Need more details.

You're runnin with a distributor, no?
 

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