I'm guessing you think headgasket or cracked head....like you posted back in 2012.. I saw that earlier. I was rethinking since my reply just now... I will do a check on all 8 tomorrow, ...because.. I did feel some "shake" when holding it steady at 2K rpms today, watching the gauge. It caught my attention for some reason, so it may be new I just made a new remote button, so it will be quick.