Few questions: 1. Can a small leak in the fuel return lines system (or injector line to injector) cause a stumble/miss at low rpm (1k-1.5k)? talking about a leak that is small enough not to be seen, but I assume is there. 2. Is it beneficial to use teflon tape so something of the sort to seal the injector line to the injector (small amount). Especially if the threads on the injector or injector line fitting are semi-buggered up? 3. I know a lot of people have problems with the return line o rings shrinking (or not sealing well) and causing air intrusion/leaks in the return system. Do you think a fuel additive like Power Service (grey bottle or white bottle), or Howes would help to keep not only the fuel system lubricated but also keeps the rings from shrinking? 4. Is there any fuel additive that could be run that would slightly swell the o-rings to cause them to seal better? 5. Would there be any benefit to using worm-gear style clamps on the return line setup instead of the regular red spring style clamps? I know that you would have to take care not to crank on them extremely hard so that they wouldn't cut into the hose, but it seems like you can be better assured that the clamp is tight with these (I hate spring style clamps... don't know why). 6. What type of clear hose are you guys using to check for air intrusion in your system. I know that most run it from the filter head to the 1st return line, but are you using some form of clear fuel line or chemical resistant line? If so, where are you getting it? It would seem to me that regular clear tubing would be eaten up by diesel fuel fairly quickly. Some of these questions apply to my truck, and some are just for my personal information. Any informative responses are appreciated!