My 89 camaro RS 305 engine TBI 5.0 has a bad idle. Well when i go out for a drive then i park and leave and go to the store i come back and turn my car on it turns on fine but as soon as the rpms go up it idels bad and it seems like it wants to turn off ut it dosent i give it gas so that it maintains stable and then after that i fixes itself it is really weird i thin it might be the IAC but i dont know so like i said the proble is that when i turn my car on the idle is really bad like if it is gon to turn off it goes doen to like about 200 rpmand up its weird