GTR Weird exhaust/sputter problem

[JDMSomething]

Hey,

So I was driving my GTR today, and sometimes it would sputter for a couple seconds then be fine. Also, the exhaust is noticibly blacker.

Do you think my packs are fouled and should be changed?

Not running as much boost as I am sposed to be? (I still have stock gauge so its useless)

My guess is its probably running rich for some reason, but not sure.

[NismoS-tune]

Odd. Every now and again, when I'm in low RPM and I load up, I get a weird exhaust sputter also but the engine doesn't bog or anything. My plugs are newer and it only does it sometimes. I try to ignore it since it's so intermittent.

[JDMSomething]

Odd. Every now and again, when I'm in low RPM and I load up, I get a weird exhaust sputter also but the engine doesn't bog or anything. My plugs are newer and it only does it sometimes. I try to ignore it since it's so intermittent.

Ya thats pretty much whats happening to me but I have noticed the exhaust has a noticible dark brown/black tinge to it

[NismoS-tune]

Ya I have ALOT of black residue in my tail pipe. The car idles like new, runs well and has factory tune. Odd... No engine light or anything.

[SRC]

Maybe check your ignition timing?

I was getting alot of black soot on my bumper around my exhaust pipe untill I checked my ignition timing.
It was retarded so I reset it to 20 Degrees BTDC and I don't have that problem anymore.

[JDMSomething]

so how exactly do you "reset it"

or check it for that matter

[SRC]

so how exactly do you "reset it"

or check it for that matter

Check it with a timing gun and you rotate the CAS to advance/retard. Make sure the car is at operating temp when you do it. I'm pretty sure the 3rd last mark on the crank pulley is 20 degrees BTDC.