just yesterday my engine started knockin, i have a 98 civic lx, with a header/cat/muffler, cai, msd cap/coil, its been fine , now its just making a knocking sound, it sounds like its coming from the bottom area of the engine, the sound is loudest right at the oil pan, and when i accelerate the knocking goes faster along with the engine.. is this rod knock?.. and how can i fix it?....it has the cadence of a machine gun at like 3000rpm