Hi, Misfires are noticeable and loud. At idle you can hear popping in the intake plenum. It disappears above 2,000 RPM. I have changed coil packs and spark plugs around. 6 to 7. 7 to 6. Still misfire on 6. Both MAFs, all coil packs and plugs are new. I have sprayed brake cleaner around cylinder 6. No change. Will a faulty fuel injector lead to this behavior? I have cleaned all injectors with Electronic Parts cleaner and test sprayed them with a 9V battery. Spray pattern on all of them looked identical. No dripping. When driving there are no misfires above 2,000 RPM. Car drives great. Sometimes it dies at stop signs. I have cleaned 6 ground points so far. Have not cleaned grounds on exhaust/cat ECUs since I do not have a slow down light. What am I missing?