My car has been throwing a random missfire code for awhile now....and I havent been able to figure it out. I just noticed 2night that my 02 sensor extension cable connector looks a little bit toasted from my passenger side header....and my car is running so rich from lack of a tune it looks possible I could need new 02's also. I have Taylor OTVC wires on my car and have also thought this to be the problem. I just recently bought some MDS wires to replace these and rought around the headers. I have changed out the plugs about 3-4 times since my header install so I know its not that. Also any suggestions on how to put in the MDS so they dont burn on the headers...and also should i buy wire protectors to keep the heat off them???

 

I put mine back where the stock ones were. Just make sure you tie strap them so they won't burn and you'll be fine.

 

The reason for your miss is most probably the opti. I had the same problem with mine which was the original with 25K miles. When I pulled the opti. found the rotor broken and some terminals corroded.

 

I know for a fact that it is not the opti as it was just replaced less then 1.5k miles ago. Im pretty sure its a wire or an 02 sensor.