[016erstang]

I have a 01 with a Diablo tune, dual flowmasters, K&N FIPK Cold air, and 4.10 with t-lock, I just got done doing a tune up on the car, plugs wires, fuel filter and oil, but i notice around 65 or so when i release the gas my car sometimes has a juttering motion to it and don't know what is causing that and it only does it at high speeds before it did it at 35 as well but that went away when I changed the fuel filter out any one got any ideas