Lets hope it's just a failed lifter.
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Yeah pretty much. If it's slight I wouldn't mess with it. If it's rowdy, I still wouldn't mess with it .Rick said the same thing. I had hemifever set it to 650 when he did the mds off tune. however long ago that was. I’m going to be honest I’m not even sure if my i3 tuner is going to work. I didn’t want to bump up the idle much because even at 650 if I put the truck in 4 low I almost have the brake pedal to the floor to keep the truck from inching forward. What is bumping the idle up going to do though? Just settle out the chop?