Unburnt fuel popping in exhaust

[sg83]

Hi everyone,

I have a '04 Coupe 6MT and it's always had a slight "pulse" while sitting at idle. At first I thought it was my engine but when I parked it in my garage, I noticed that the sound was coming from the exhaust. Also, my exhaust has more soot inside the tips than other Gs I've seen.

Now my first thought was that spark plugs need to be changed (which they did) so I changed them. At the same time, I also installed a 5/16 MD Spacer and reset the ECU. Well my car seemed to idle great when I first changed plugs and installed the spacer but now after about 2 weeks later, the exhaust noise is back and worse than before...

I've been reading and it seems like there's some unburnt gasoline getting through to the exhaust?My car is completely stock other than the Spacer.

Any help is much appreciated. Thanks. BTW, the car has 54k miles on it.

[Tampa G35 Sedan 6MT]

I think that is from a heavy foot

I don't know but im sure one of the other guys will have an answer!

DJ

[joe603]

Mine has it too....