Sorry to unearth a farely old post, but the problem was the Cat converter...Due to the fact in WV no emmision test is needed, my brother and I simply cut the pipe at the weld on the U-Bend and drilled a large hole through the converter's innards and then got the impact wrench with a straight rod and beat out the innards, periodically starting car up to blow out the chunks that were broken up. After that a sleeve was C-Clamped on and it runs amazing, doesn't sound half bad either. So to anyone with a 2001-2002...You should probably start here if any engine problems are encountered.