Only bought this yesterday and now its developed a fault. Got in this morning and started it and it wouldn't stop revving. Like I was blipping the throttle and taking it to 4000 to 5000 revs. So I put it in drive and went off. It was running away with me and had to keep foot on the brakes. Then when put into neutral the engine just spun round to the rev limiter and sat there. Any help greatly received. Thanks.