Awhile back I had a problem with my carb that the ticking istopped and it made and carb not work right. It would die if I mashed the gas but would hold idle fine. Now I got another carb and the opposite is happening. It will not idle or turn on unless I got my foot on the gas. I turned the idle screw on driver side and it will turn on by itself but its like 1800-2000 rpm after its warmed up. Would could it be?