my lil sis car shuts off when comeing to a complete stop. idk what it might be. when put in park it has unidle rev from 800 to 1100 rpm. its an automatic d15b7. all stock no modds. it shifts kinda late about 3500 rpm and i think it should at about 2500-3000 rpm any help will do. thanks

 

found out her catalytic converter was clogged.