We where parked outside an mall and we started up our Honda Pilot 2004 then the car started shaking like if a pipe or a tube was clogged. Then when we started to move The VTM-4 light turned on red aswell as the check engine light which was yellow. When we accelerated the check engine light flashed and when the car deaccelrated the check engine light was steady it never turned red. After a few moments when we where on the freeway about 30 miles away from where we left the check engine light never flashed even when we accelerated and the shaking stopped. After 50 miles when we got home we turned off the car and started it up again after about 15 minutes the VTM-4 light didn't turn on, the shaking never came up, but the check engine light was still a steady yellow. There weren't any sounds like something clunking. We are wondering what caused this and can someone help us out Thank you.