I did some work on my truck new long tubes, full exhaust, headgaskets, I installed a fresh set of tr6 iridium plugs.

Double checked everything no loose plug wires leaks or problems. Not tuned yet.


I am getting missfires at idle. every cylinder missfire.

I want a colder plug going to run a little nitrous. Is this tune related or ???

 

What exact plugs did you install and what gap?

 

Ngk 3689 called ngk they said it's a tr6 iridium

 

What was the gap?

 

they were 0.04 from ngk I left the like that.

 

Not much of a gap there if that reading you posted is actually .004, are you sure that you didn't typo the gap numbers.... Should look like this .040 +/-

 

I don't think I would run a fine wire plug with nitrous. Something like a BR7EFS would be my choice.

 

Double checked everything.

at idle= slight missfire
while driving absolutely no missfired while on the gas.

No check engine light Shows on scanner

 

Sound like vacuum leak.
Y

 

Look at long tern fuel trim at idle