Hi I have a 1999 civic coupe with a 1998 b18c1 rebuilt with integra type r internals, skunk 2 stage 2 cams and gears, with a pro series intake manifold, short ram intake, apexi ws2 exhaust, 310 injectors, new spark plugs, ngk spark plug wires, Hondata s300 and stock headers and I still have a cat on my exhaust. About a week ago my speedometer went out, but it has been driving fine maybe a little rich. I was driving it last night on the highway in 5th gear at about 3 grand, I went to accelerate and it didn't accelerate at all I tried this three times before downshifting to fourth and it was still barely pulling, I immediately pulled off of the highway and my car just kept stalling at everytime I took my foot of off the gas. I went to a gas station and vacum hose on the intake manifold was off I reattached it and drove it 5 blocks to my house. It was still stalling everytime I took my foot off of the gas. Today it won't start at all, and black smoke shot out of the throttle body when I had the intake off today and let off of the starter. The o2 sensor closest to the cat is bad as well. When I try to start it, it sounds like it wants to start but won't turnover. Any ideas? Thank You