Today, we got a flat tire, so went to put spare on. The jack bent when we jacket it up..so had to borrow jack from neighbor. Once we got the spare on, it made a funny noise..on the way home, it wouldn't drive over 22 MPH, and once we replaced the original tire (got a new one/fixed), the car started to accelerate and brake itself!! It was definitely not normal. And there was no resistance to the pedal or floor mat interference. I believe it was a computer problem? Anyways, when you hit the brake (cause it was going so fast) you could hear the engine strain as it groaned to a stop. Got the car home and in the garage for the night..That was work in itself, not driving it through the wall! Arranged to get the Prius towed to Toyota in the morning..see what they can do. It's intermittent when it does this, and very weird. Any suggestions/comments? ALSO, it only did it in gas mode, NOT electric/battery mode!! Btw, the spare tire also went flat while driving, with no holes, nails etc..was VERY weird.