Spark plug for this engine does not have an adjustable gap

 

Yes I have a CAI tune. Superchips Tuner. Old air intake is gone. will check the FPDM.
Still trying to understand why only #4 and #7 misfire.

 

They are adjustable with a proper gapping tool and can be checked with a feeler gauge. I just ordered a set for my 2007 supercharged truck and gapped them from .045 to .032. The gaps can be off. Just a suggestion.

 

You'll have to show me that...

 

Hopefully it's just a wire issue at the cop or injector on those cylinders like vintageman suggested..

If not I'd check the VCT solenoids on both banks, and clean the screens if they are dirty..

You hear any ticking in either side of the engine under valve cover? Could be some valves starting to stick or lash adjusters seizing up on those cylinders.. A fresh oil change with some marvels mystery oil might help too..

 

One suggestion... ditch the MMO and get Kreen.

 

Here it is

 

Need a link. Can't see embedded pictures at work.

 

I'm not one for suggesting additives besides injector cleaner. But I've tried MMO, and it does work on freeing up sticking parts.. If kreen is from Kano labs like kroil, then I will definitely give it a shot one day, kroil is absolutely the best penetrating oil I've ever used..

 

Here's mine