I just bought a 2006 Explorer and i just replaced the front rotors and all of the brake pads this evening. I took it out for a test drive and when i was on the way home the 3 lights came on. I pulled into the garage and shut it off and turned it back on and just the abs light came. It was acting a little funny while i was driving. It felt like it kept downshifting and upshifting. Its been fine up until now. What should i check?