How does the engine seem to run? If rough, we should check the compression by following this guide. Also, can I ask how the spark plug looked when it was out on #1? If it was a dark or light color compared to the others, you may have a fuel injector going out. Either way here are the guides to help us get started also I have included images below to show you how to do the job.
https://www.2carpros.com/articles/how-to-test-engine-compression
and this guide can help as well:
https://www.2carpros.com/articles/how-to-test-a-fuel-injector
also, a good guide to go over:
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.
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Saturday, January 27th, 2024 AT 10:50 AM