When my 91 Integra is idling, the RPM's are going up and down from
1500-2200 RPM,....like it the car is breathing....:). This started just this weekend. Also noticed my temp gauge stopped working when this weird idling began or maybe the weird idling started when the temp guage stopped working. The temp needle stays on C, never raises to operating temp. I also noticed the heater air temp, is not as warm/hot as it normally is. The car runs fine other than the weird idling.I suspect a faulty temp sensor/sending unit or a faulty thermostat, causing the idle issue.
What do you think Tegger?....or anyone else.
THANKS!