The nissan is running of course. The only problem with it is that it jerks really bad. Let me explain...
When I try to speed up it jerks back and forth really bad, but it doesn't do it if I take my foot off the gas. It does it really bad the lower the RPMs are, but once I get to 3k RPMs it stops jerking, and it feels like it comes alive. Up until 3k it's really slow even for a 4 cylinder. Any ideas?

