That doesnt answer my question. I've owned a wrecking yard for 23 years and this a real basic techniques to diagnose an engine knock. I just want to know what playing with fire means? Doesn't make sense. I'm open to learn. We use a squeeze bottle for a fuel pump or a windex bottle sprayed directly in the intake for a carb. That may be playing with fire but how is running a 6 cyl on 5 cyl ?Mark has been a 40-series mechanic for a living for more than 40 years. If there's anything he doesn't know about F-series motors, it's not worth knowing.