yes, check the 2 dog bones that keep the motor from rolling front to back. They are easy to take off and check. If the rubber is even the slightest bit cracked, it is allowing the motor to roll under torque.Ranger said:Motor mount would be the first suspect.
They are availible from all parts stores are fairly inexpensive.
Just remove the 2 long bolts on each end. They go back together as easy.