I just recently installed the Focus Central 65mm Throttle body and followed instructions to spec. I noticed that the idle is slightly off than before. When revving the engine to 5000 rpm and the back down the idle drops immediately to 1500 rpm than takes about 5-10 sec to drop down to 800-900 rpm. Is there any possible reason for this occurring? I went ahead and pulled the battery cable to reboot the ECU. I can't think of any other resolution. The TPS sensor is in the correct position. Does the position of the TPS sensor dictate the idle speed? Is this situation normal for the larger throttle body?