1st off, i have searched nothing really helped me. ok so i have a new engine maybe only 300 miles on it and it used to idle high. one day it just stopped idling so i took it all apart looking for vacuum leaks and replaced all gaskets and now it starts up and stays at the 3000 rpms for a lil then dies unless i put some gas on it. it also back fires at about 2000 and under. i also tried the idle adjust screw but that isnt working either. also it is very hard to start up i usually need to pump the gas for it to do so and it floods very easy. i dont know what else to do or look for. please help


87 n/a base