me and a friend installed an itr manifold on my b16 last week and it was running fine.. then about a week later my car started bogging and acting up it was misfiring like crazy.. so i checked for vacuum leaks and nothing then i checked my spark plugs and they were black!!! i mean you could smell fuel or something like that! and out my exaust was a strange odor!!! so i changed my plugs the next day thinking it was going to be ok! but its still doing the same thing! its boggs and when i sit in the car it shakes like crazy.. so i dont even wanna drive it like that! it feels like the motor doesnt have any power!! anyone had this problem??? what can i check for???? any advise????