Q. When I turn on the heat in my mustang I notice the RPMs fluxuate up & down. At first I thought it was the result of me installing a TB, Plenum,& CAI in my 00' GT. Yesturday I noticed that as soon as I turned on the heat (Not AC) the RPM began to change up and down right away. Does anyone know the cause of this? I don't have a check engine light on or anything. Also when the system is on the RPMs hang and drop slowly. It does not do this with the Heat off. I was going to buy one of those restrictor plates but now I am not sure. I do not understand why the heat would effect the RPMs of my motor? The AC I could understand but not the heat. It has been doing this for some time now but when I added a new TB (MAC) and Plenum (ACCUFAB) it became really noticable.
Anyone know the cause & solution to this problem?
Thaks all
Anyone know the cause & solution to this problem?
Thaks all
