Well, it has been over 100,00 miles since the plugs were changed. Now I have a misfire on cylinder #3. #3 is in the middle of the left side of the engine and is very close to the firewall. I've read that the engine has to be unbolted and tilted in order to get to it. I'm betting that wasn't done and they left the old plug that would now have over 150K on it. The first shop that I had change the plugs years ago, used regular $2 each plugs. Should have used the platinum ones. The second shop used platinum ones and may not have replaced #3. Seems really coincidental that it's the one with a misfire. Not replacing #3 is simply a guess on my part. I need some place that will do it all correctly.
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