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Yes we got it used with 65k or so. Don’t have any clue in service. Did add the treatment you shared this afternoon and the problem went away. I am shocked that that worked the way it did. Thank you for your help.

Around 75k or so. I added the instant surge stop this afternoon and it’s seems to be fixed. It had got just about unbearable to drive. It’s my son’s rig. He is in college. He stays on a campus and only really drives it when he comes home. He was telling me how bad it was. Hope it fixed. Thanks...

Your issue is a little different. Mine is constant, at any speed. Does it worse at lower ones as far as the affect of how it’s felt. I’m going to order the anti flutter additive that thomasm23 shared a link to a tread. Hope that will work

Best way to describe it is like one is bumping the throttle repeatedly. Rpm jump up and down

New here. Maybe beating a dead horse. Have had my sons 21 base 1.5 for about 8 months. Engine constantly surging. From easing around back roads to cruse controls on the interstate. Have put a new battery, plugs, air filters, and cleaned mass air flow. Dealer has done all the updates on it but...