I have a 10 year old Yardbug . recently I was driving it and it suddenly stopped. This has happened before when one of the drive belts broke, when I replaced the belt it was fine. This time I replaced both belts although the old belts seemed fine. but when I put the gear shift in forward and try to drive it the thing wont move. the gas pedal is very stiff and it feels like the belts are going to start smoking.