Bought this older Honda HRT214 mower. Starts on the first pull, goes into over rev, till you can get to the throttle to slow it down. Then will run Ok till you engage the blade. Then it will run for about a minute, and then slowly begins to sputter and quits. If you push it to auto choke then, it will start again on the first pull again, and you can repeat the whole cycle again. The over rev is the first problem, and shutting down is the second problem. Both may be related, but not sure what it is. Any help would be appreciated.