Please help me out, I have this dreaded 300 code that will not go away. Also I have a emmisions test coming up next month. I really don't know what I should do next. I have tried taking It back to my tuner, and still I get the check engine light with the 300 code. Maybe I should try taking it back to my tuner again. What do you guy's think?

 

search button, there is a bible on this topic

 

in the ECUFLash forum there is a thread about how to turn off that test entirely while maintaining the ODBII readiness state needed to pass emissions.

 

when does the misfire occur? under what conditions?

 

do you have aftermarket cams?

 

that is a good idea.. do what he said

 

it works well too.

 

is there a mitsu tech availible to give us a real world diag process on this?