Arghhh! Try this: https://www.2carpros.com/articles/how-to-test-a-fuel-injector
And I definitely understand not wanting to pull the upper intake off just to check a fuel injector. If you're going to try injector cleaner, I suggest the Lucas brand one (available at the local parts store). Put that stuff in with about a 1/2 tank of premium gas (preferably shell or BP, something with a lot of cleaning junk in it). Take that car for a ride, and open the throttle up a few times, without getting a ticket, that is.
If your problem is a sticking or clogged injector, this is probably your best shot at cleaning it out without taking that intake off and replacing it. This has worked for me a couple of times.
It's also a possibility that you've lost some compression in that cylinder. You can get a compression tester from AutoZone or another parts shop and check it against the other cylinders on that bank. Here's another guide: https://www.2carpros.com/articles/how-to-test-engine-compression
Good luck and let us know what you find.
Thursday, October 5th, 2017 AT 7:28 PM