i am having some sort of bump or miss at bout 45 mph under no acceleration just keeping it at 45 it does this worse in chip mode especially after getting on it. it does it worse at 45mph but some is around 30 or 35. it is not a skip but what idescribe as a bump bump noise. i have no idea what it is or what to do. it does do it on the stock program to but not as bad as the chip mode, i have the superchip and psp filter, and i got the chip back in september and have maybe 3,000 miles on the chip, 5,000 on the truck, what should i do, thanx for the help as i know you will give. any advice would be appreciated.

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Rusty McLain 99 Red Lightning w/ cd changer and towing package,superchip,and PSP Filter and a red 94' lightning.
99' 1/8 mile 8.76 @ 81.6mph