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1995 Toyota Avalon Question: If I only change 4 spark plugs out of 6 spark plugs on v6 will it effect the ca?

 

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IHOP, 3.0L V6, Salt Lake City, UT, December 09, 2013, 04:23
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None of the spark plugs went bad or anything like that. I am doing a whole tune up and wanted to know if changing 4 plugs instead of all 6, will doing that have any negative effect on the car? The other 2 plugs that didn't get changed are still OK and have had no problems. Just would like to know asap so I can know if I can start it up when tune up is all complete.

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