Presnut22

I need help! I'm new to owning a rotary engine and am having trouble with it dying when coming to stops. I have a Mazda rx8 2004 not even sure what engine but is automatic. As i am coming to some stops the car doesn't shift down properly causing the engine to die with no noise. It then has trouble cranking back up for a minute or two. It usually gets stuck in 3rd gear and rpms just do not stop dropping until it dies. Is it the speed sensor or what? I'm very familiar with piston engines but like I said I have no idea about a rotary but excited to have it!