Swapping the plug and coil is a good easy test. A compression check will help eliminate (or suggest) some possibilities. Compression testers are cheap and not too hard to do the check. Possibly the injector on 5. I've never had a bad injector, but i expect it can be swapped with another cylinder to check if you don't want to take them all to a shop.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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