So the issue started with,bad 93 octane gas so my 2005 6mt usdm 6 port started having a misfire under 3k rpm. First changed the cat. Better but no cigar. Second came coils. Again better. Next I changed the dirtiest at filter ever,and,cleaned the maf sensor and throttle body. Checked for vacuum leaks and there are none. None of this,fixed it. Next I cleaned the ess and cleaned the kam and did the 20 brake stomp. Next I just ran,it to 9k rpm a few times and wow it actually started to get better. Today i found the issue. Changed all 4 plugs and the leading plugs were brown, which is great but both trailing plugs were totally black which means carbon buildup. Got it,all done and I have never ever seen my 8 run this good at all rpm. I'm very happy about this, so happy in fact that I made a thread just for it so anyone else with a similar issue could see all I needed to do to fix a low rpm misfire. Using this site has definitely made a huge impact on my ability to work on my 8 and troubleshooting is so much easier with all the diy write ups and stickys, I'm really thankful this site is here.

 

Glad things worked out.

For more fun, check out the congrats thread below....