Hello, im new to forum. I have 2003 people 50cc 2t kymco. carb has been cleaned, new battery, fuel filter cleaned, new plug. it idles great. quarter throttle its like the power goes off, it dies and when throttle down it comes back, it has on 2 occassions reved up. it will rev up if I place my hand and partially cover carburetor intake? fuel pump is steady streaming also.