Quote Originally Posted by jesse4846
it sounds like it could be an O2 sensor.

did you still have a CEL with the other MAF in?
didn't think about the o2, which would make sense with the tuning.

yeah, I put in the other MAF and it stopped the surging, but it idles at 1500-1600rpms with a CEL. I haven't tried to drive it with this maf but earlier it was too rich.