Hey, heres what happened: I was flying down a hill and floored it,only going 35mph,then when I came up hill my 1980-Columbia Commuter Moped started bogging down,and just before it died I tried pulling in the choke ,and let up halfway on throttle,and engine stayed on for two more miles home! But without doing that it quickly died. Night before I mixed one bottle 2-stroke oil with 2 gallons of gas.What is happening! Can I flood it ? whys it die? Help!