My 1981 308GTBi when started cold will idle at 3000RPM until the temp hits the second temp mark or 6-8min at 60deg ambient temp. When I bought the car 9 years ago this symptom was corrected by taking the two wires from the coolant tank and shorting them. This disabled the 3000RPM emissions program by faking the temp to always be hot. This worked for 8 years, but months ago (when I was trying to fix the running on 4 cyl issue) this popped up again. I checked and I have the coolant tank wires still shorted properly. Any help would be appreciated.