the other day out of no where my car started awckwardly and then had a low idle, almost as tho it wasnted to stall, though it wouldnt. it would stay low until i drove and it would be fine later. it has dont this everyday since, from cold it is rough and the idle is low... any ideas? it also has been raining a lot around here...i only put 93 octane in it....

 

It could be the Cold Start Valve is not functioning or erratic. It put a bit more gas in the mixture when the engine is cold which raises the idle a bit (close to 1000 rpm) for few seonds, then it shut itself off and the idle drop back to normal.