It sounds like you have a fuel injector that is stuck open or a MAF sensor that has gone bad, we should run the codes first. You can get a code scanner from Amazon for about $20.00.
Here is a guide/video to show you how:
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Here is a scanner link:
https://amzn.to/3Qi1SS6
Spark plug - Standard type .................... PLFR5A-11 NGK
Next, I would remove the spark plugs and leave them in a line with the cylinder to compare them. The one that looks different will be the cylinder that is having the problem, I would check that injector. Here is the location of the MAF sensor and how to change the injector out in the images below.
Images (Click to make bigger)
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Friday, August 26th, 2022 AT 10:58 AM