A couple months ago I was getting some major spark knock along with a lean engine code. I replaced the MAF sensor and all was fine. Then today I started to hear slight intermittent spark knock again. I put in some more gas and some fuel treatment. Any thoughts. It happens in the first couple of gears when the engine is under a load. Usually around 3000 rpms.

 

Ok I tried to disconnect the battery. After about 5-10 minutes I hooked it back up. no I can't really get the sound to reproduce itself. Does this help any?