Mine did the same thing. Your Carb needs a good cleaning. I took mine apart but I don't recomend it, it is very tricky. I left the old gas in it, 2 years. Once I cleaned and replaced the fuel it should have worked but I ending up having to pry gap at the top a little wider and at the same time pry the adjusting screw caps out the top. I don't recomend this unless you are willing to replace the whold cab. Good luck
Joel
October 2009