Have a Car Question? Ask a Mechanic Online.
Does it misfire at idle?
Try spraying some carb cleaner along the intake manifold to check for vacuum leak. Do this with the engine running. If the idle smooths out or the idle speed increases, then you have a leak. If not,then based on what you have already done, you should do a compression test. If the compression is good, then I would suggest swapping the fuel injector with the one next to it and see if the misfire moves with it. If it does, then the injector is the likely culprit.
Please let me know what more I can do to assist you today. Also, please remember to rate my answer, Just Answer does not compensate me for my time and resources. Follow up questions are included in the price of your question. If you are using the free trial, a rating is still required.Thank you so much!
I see, you didn't specify you knew what the problem was.
Are you 100% sure this is the problem? How did you test it and what other tests have you done?