So, I had a post earlier this week about how I had an injector that was making noise. Well, after talking to three technicians, they all strongly suggested that the noise may be a lifter. So, I added some detergent to the oil and the noise went away for a day and came back. I then drained the oil and idled the car for 20 minutes with a 50/50 mix of tranny fluid and oil, ran some top engine cleaner in the car, put in a can of intake cleaner, and finally drained the ATF and oil and put in some fresh oil with a small can of engine oil supplement...and I still have the noise. The engine runs fine (actually it runs better now after all the injector cleaner and other detergents I have put in it), it's just the noise persists. What should I do?