Comments: I just changed plugs in my 2001 Porsche Boxster for the second time every 5k or three summers in my case. I used Bosch Platinum Plus 4 plugs. I took care to check all ignition coils for wear or cracks, all looked like new.
When i started it she fired immediately and sounded good. But when I took it on the road it feels sluggish. The car had more zip before I replaced the Beru plugs that I put in there three summers ago. Could I have a bad plug? How can I check the plugs? Love the forum, I have done most of the work on this car myself with your help and parts.
May 1, 2017
Followup from the Pelican Staff: Does it feel like a misfire? If not, the plugs are likely OK. You could be feeling something else that just popped up. - Nick at Pelican Parts
Thanks Nick. I don't think it is misfiring. The sound is more like a wavering. What else do you think it could be?
I was going to replace the old plugs one at a time and test the car after each replacement. Bad idea?
Lou
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Porsche Boxster Spark Plugs and Coils Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article