Intermittent vibration felt in both gas and brake pedal
2005 3.7 WK and QTI transmission. Was driving home from work and felt a slight vibration in both the gas and brake pedal. Was going maybe 20-40 MPH. I could feel it when accelerating, braking, and coasting. I popped the car into neutral to see if it went away and it didn't. I stopped, backed up, no difference. Even tried hitting the brakes hard to see if it made a difference - none. I got on the highway and brought it up to 65 MPH, could still feel it. Eventually, it went away after maybe 5 min.
Car has 61k on it. Tires are fairly new with 6k miles and pads, rotors & shoes changed 2k miles ago.
About a month ago I had a severe vibration coming from the rear (the "rumble strip" problem but that's only happened 2x and isn't reproducible).