Mazda Protege Engine Idle Erratic

My Protege Is Idling Under 100 Rpm. At Times When I Have Been Driving It In Traffic It Will Stop Because Of Lack Of Gas. Also When The...

When I Start The Engine, It Cranks Normally, But The Rpm Up To 1000 And Down Less 500 And Engine Stop, It Is Only The Engine Are Hot, The...

So I Am At Work Right Now And On My Lunch Break I Went Out To Grab A Smoke And Sit In My Car With The Heat On. As Soon As My Engine Started...