1993 Mazda MX3

Can a bad idle air control valve, cause ruff idling, and hard to start?
I have a mazda MX3 and when i bought it, the guy told me it had an bad idle air control valve so i changed it and put one on from the junk yard and it still doesn't work, they both have scratches where the computer connects maybe that's a problem im not sure. But what other things can cause my car to do this, Can it be a bad air flow sensor as well? Because i really have to push the pedal to the floor and turn the key for about 8 seconds or more for it to start and when i put it in drive if im not giving it gas it will die or stall out when coming to a stop sign/ light. Also when i turn the air on it will die, even if its on park, and turning the steering wheel also causes the RPMs to lower when im giving it gas. Please help me out im getting frustrated, But whats the chances of having 2 bad Idle air control valves, Should i just buy another one?