Alright, I have a "knocking" noise on my 97 jeep cherokee 4.0... It is loud and gets quicker with acceleration, knocks at an idle but when I'm driving on the highway and let off the accelerator to "coast" it goes away, but resumes when the accelerator is pushed... It does not go away after it heats up. I did a test and pulled each plug wire off one at a time to see if it changed anything and it didn't... The noise seems to be coming more from the rear of the engine and is loud underneath as well... Any ideas??
oil levels are fine, no leaking...