Just had a Toytec Ultimate Lift installed on my 2007 A/T 4x4 and I noticed a vibration I can feel on the pedals or floorboard every 5 seconds. It will be quite for 5-7 seconds, then for 5 seconds I can feel a slight vibration. I don't feel it in the stearing wheel and it doesn't see to matter how fast I'm going either. I also tried to see if it stop if I took my foot off the gas and it doesn't. Any ideas what it could be???