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Replaced plugs on my 2008 5.4L 3 valve. 6 of the 8 broke after following recommendations for removing them. Used a vacuum with a hose to try and remove debris when pushing tip down. Had 140,000 miles on plugs, before it ran a little ruff, may have clogged converters because I couldn’t accelerate much. Now it runs worst, won’t idle, missing. Pulled plugs back out to try and do a compression test. Noticed one side plugs were very clean like new, the other side were kind of dirty already. Only code is for a stuck O2 sensor. Also where can I find a adapter to do a compression test. None of the ones I have fit. I have done this before and never had a problem after changing broken plugs.
 
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