I am gonna kick the shit out of this thing. I replaced the o2 sensors today and all seemed well on the ride to work. On the ride back, it started doing it again at sustained highway cruising speeds. Additionally, my factory tach has always been jumpy around 4k but now it is everywhere. The VAFC does not show any jumps like the factory tach does so I am stumped. The only thing left that I haven't replaced is the distrubitor. The car now reads a little on the lean side and NEVER goes rich unless it is from a cold start. 12 MPG is not fun anymore.