It sounds like a bent or out of balance front wheel. If you want to check it yourself:
Set park brake and chock one rear tire both front and back of it.
Raise a front tire off the ground. Hold a stick steady near the outside edge of the tread.(Rest end of stick on the ground to make it easier.) Hand rotate the tire, watching to see if the tread varies to left or right of the pointer(stick). Also feel backside of rim for dried clods of mud. Check both sides of tire for large bubbles or if the tread has an unusual zig-zag all the way across it. This could be a broken cord in the tire's body.
Same thing other side.
Do this or have it checked somewhere soon! This could be very dangerous!
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