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Message: <blockquote data-quote="slade8" data-source="post: 2087888" data-attributes="member: 70145"><p>I loaded the 5startuning 91 octane performance tune tonight. The idle miss fire or shutter-shake you feel in the seat and floorboard is still there. Unfortunately, this rev-x sct programmer doesn't indicate the max and minimum rpm when in gauge mode. I have to eyeball it and the idle rpm is jumping up and down between 629 min - 660 max. Mostly it's running 640-655 but you can't actually see the exact change in rpm when it seems to miss fire. The 91 octane tune feels better using the arse dyno. The engine purrs on the road and the upshifts are much smoother. The tune seems to keep the truck in the best gear and for the right length of time for the best performance imo. It's a lot more enjoyable to drive now. So either I am getting used to this idle or the tune has made it less noticeable with only 40 rpm in movement? I do not know the idle rpm range prior to the tunes or any of the other things I tried such as crf and cro 505 treatments last month.</p></blockquote><p></p>