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If they get bad enough then yes, but they could be on the way out causing issues, and may not throw a code. Just unscrew them, and if they look completly covered in thick black exhaust dust, then it would probably help if you changed them.
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95 Z28 M6, 383, D1SC, FMIC, ect., ect., 614 RWHP with the stock PCM and pump gas!
98 Formula WS6 M6
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