New to this picked up 88 HF and it starts and runs till it is warm. If you are driving you feel the accelorator cut out violently then some times kick back on. If it doesn't kick back on the engine starves of no fuel then dies then it wont start again untill it has been sitting at least 30min. Dies about 10 min after starting if idleing or about 1 mile if driving. Any ideas. Stock motor by the way.