When I start my car in the morning, it idles very slowly like a tractor or something. Once it is warmed up, however, it idles high around 1400-1500 rpms. At first it is steady at 900, but then it goes up. It is like the choke (automatic) is working backwards. I rebuilt it about a month ago, could I have hooked something up backward or opposite (such as a temp guage or something) Thanks.