Loud Engine Noise
So I recently changed the IAC as well as the spark plugs in my jeep due to it idling very high (2000 rpms or so). Once I changed all that, i realized that there was a loud sound coming from the engine. It only does it when it idles low, get it up to about 1400 rpms and it stops. It sounds like an exhuast noise, but I dont think so since it stops once the rpms get higher. Any ideas?