Only way to find out is to remove the plugs and check, but it seems to always be the problem. BTW, seems like you're running turbo, are you running a step colder?

 

Check ur plugs first. Did you swap em out when u went turbo? Is it rrms?
Do you have a wideband running? What readings you getting?
Is it throwing the car in limp mode?
I had a similar prob with mine an it was a small hole in a coupler.
Triple check all your IC pipes.
Need mor info

 

i had a lot of bogging at first. when i changed my spark plugs it worked fine.

 

Need help my Evo Mr just start bogging like 3 days ago normal driving fine if I step on it to boost it boggs backfire help I changed plugs checked all intercooler piping tight need help like asap

 

wrong section, but do you have a wideband? knowing what the AFR is at when it's bogging would be helpful.

 

Mines was doing the same thing I have a 2010 full exhaust Cobb stage 2 acessport Evo turbo intercooler injectors it was the fuel relay change both recommend the blue relays they work better car is back to normal now

 

Change the fuel relays both them