alright so i got a new engine my car a week ago and i love it, i love the way it pulls and what have you. but i am a little concerned. when i start the car up in the morning after sitting all night it idles at about 1500 then it drops down to what looks to be between 7-500 rpm. i adjusted the idler screw to see if that would solve to problem as far as it idling to low a few days ago now it seems like it starts up high and then still kinda idles low. any idea on why that could be?