Had a #6 injector put in mine a few years back the dealership botched it and either dropped something in the cylinder or the new injector blew its guts into the cylinder. I ended up with the same ticking and loss of power and even some smoke, 2000 miles later I was having the engine rebuilt, something was in the cylinder and it passed through the valve screwing its seal to the head up, destroyed my turbo and I had bad scaring on the cylinder wall.
Between the two dealerships I did an oil change and noticed a very strong fuel smell in my oil, this tipped me off that something wasn't right.
I know this information isn't very helpful but I felt you should be aware of another possibility and always scope your cylinders when change injectors, you never know what you'll find.
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