So I did a cab swap on my 95 ram but now my heater wont work...its the old dash and it worked before...I have power commingle in and out of a relay under the dash but no juice to my switch I tried tracing it out but I'm all out of ideas...also my truck idles weird it will idle low almost to the point of dying then idle normal it does this whether its warm or cold what could cause this? Censor maybe?