I drove my car out this morning to where i meet my boss man to go to work, it is about 15 miles away, anyways the car ran fine and plenty of power. Well this evening i got back to the meeting spot and when i got in the car and cranked it up it at first didn't want to start and then i gave it gas and it cranked up. It idled just like it had the biggest race cam you could put in one. it had a choppy idle on up to 3000 rpms so i drove home in regular drive gear to keep the rpms up and when i got home the motor ran fine no rough idle instead a calm smooth idle. This is a realitively stock motor and i never had this problem before. Any ideas?????