have a B18C Type R and just yesterday after getting off the freeway, I noticed below 3500 RPMS the engine starts shaking and bogging. AS soon as I came to a stop, it idle terribly below 1000 rpms like it wanted to just die and shut off. I pulled the sparkplug wire from cylinder 1 and 2 and it did nothing to the idle, it continued the same way. I just replaced the spark plugs and wires this past Saturday. But when I removed the spark plug from the first cylinder, it was completely black....what could cause this? Please help!