you're probably right, I would look for a vacuum leak first.

It was a massive vaccum leak, somehow I forgot to tighten down the intake bolts. when I put the intake on I only snugged them up untill I got all the bolts in, but somehow I forgot about it.

It runs great now, the exhaust doesnt sound that great. I'm thinking a straight through muffler will cure that. I was wanting it to sound more like my straight piped 280Z, but it sounds NOTHING like it.