It could be the fuel injector has gone out, but we should remove the spark plug on #3 to see what it looks like, if it has very little color on it the fuel injector could be bad. Here is a guide on misfires that can be helpful, and I have included how to change the fuel injector out.
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
These engines had problems with the valve train, when the engine is running can you hear ticking coming from the #3 cylinder? Check out the images (below). Please let us know what you find.
Images (Click to make bigger)
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Wednesday, October 11th, 2023 AT 8:21 AM