Howdy. I've been having a misfire at all speeds and rpms in my truck. It seemingly gets worse under load. It has new (factory iridium) spark plugs and Denso O2 sensors. Fuel is 55 psi with key on/engine off and just over 60 running. I just cleaned the throttle body as well. This came out of the blue... Do y'all see any clues as to what it could be in the log file? Thanks.
-Andrew Kitchens

 

stock or aftermarket cam?

 

Stock cam. It's an '05 lm7. Headers, tune, converter, gears.

 

Something is obviously very wrong there, the spark is very erratic.

Post the tune up so I can take a look at it.

 

The tune is locked. I have an autocal, but my problem is trying to get the misfire counter pids to work on efi live scan and tune. I'm looking around for a tutorial currently.

 

Who tuned it.

 

Black Bear Performance. The file can't be viewed or modified.

 

Did you check the plug wires for any burns or problems?

 

That would narrow it down to #5 and #7 plug wire. I have Obx headers with the stupid hump... Though, they are wrapped and the wires pulled away. Thank you much for the help, sir!

 

If the wires are touching even if they're wrapped that is a possible cause for your issue. The hump on those headers suck, I had them back in the day