i put a new motor in my car everything is stock except for i have an edelbrock performer rpm intake and a 70mm t/b and better headers,and i cant get it to idle at 900 it wants to idle at like 1500 then when u hit the gas it goes down.and it also seems to hesitate when u hit the gas,but it doesnt do it all the time just when u hit the gas like when u floor it.does anyone have any ideas wut could be wrong.