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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.I have enclosed the injector and the circuit test steps in the link below. Copy and paste the link to your browser to open and view it. It would also be useful if you can scan the system and see if there are any fault code setting and post back with them .https://dl.dropboxusercontent.com/u/104923897/Injector%20circuit%20Mar%203.pdf
It dose not sound like a failing coil and or even an injector. Have you checked to make sure there are no vacuum leaks in and around the intake area?
I would also run a regular compression test and then do a running compression test on each cylinder to see if perhaps you could have a valve sealing concern.
I would still run the compression test to at least rule it out. Injector are usually either good or bad. One other thing you may want to do is to have the injectors professionally cleaned in case you dealing with sludge build up on the tips of them which could affect engine performance.