hi i think i have a problem but i'm not sure if it is a problem:-/.when i take my oil cap off the car, the car still runs witch did'nt used to happen.i'm just a little concerned that somthing is blocked.

allso could any one tell me what the screw under the throttle body dose it's a screw with a spring over it right next to the throttle position sensor.i found it to be lose today and i could here air coming from it.would this cause me problems starting witch i am having
cheers peeps