This just started happening today on the way to work. I shift into first at a normal rpm, and the car is sputtering and spitting, then after like 3k rpm, its as strong as ever and roars thru the rpms. It does this inconsistently. Sometimes its like the problems not there, then at the next stop sign, it does it all over again. If I stop and park right after a particularly bad sputter session, the idle is uneven and dips down to 500 rpm up and down sometimes. At first I thought it was an exhaust leak, but checking every connection from the cat back showed all the bolts were as tight as possible. The only other place it could leak is at the exhaust manifold, which I was unable to tell if it was leaking or not. I'm aware that it could also very well be an electrical or fuel delivery problem, but I can't check that stuff at the moment. I guess I'll have my mechanic look at it tomorrow, but this was so weird how it came out of nowhere, right after I had just got it running perfect with the vtec oil pressure sensor fixed and the VSS fixed. Like went from running ferocious to almost dying half the time, in about 24 hours flat.