hey i have some what of the same problem. I drive a 96 hatchback with a b18c1 sawp. When i hit around 5 rpm it spudders really bad back and fourth like crazy and my v tec wasn't working. I checked my ground and it was cracked so i replaced it and it didn't seem to be the problem. I realized that i had a header leak. So you might want to check on ur manifold to see if its leaking air through bad gaskets, and check where ur headers bolt on to ur exhauste pipe.