Quote Originally Posted by SgtMarshal View Post
could it be the O2 sensor or Maf?
I mean, I really don't think so with the misfire isolated to 3 & 6 only.

Quote Originally Posted by Scottydoggs View Post
got to be a bad wire. off the icm or to the injectors. check that metal harness loop on the do bone. see if theres any damaged wires inside that area.
I'm leaning toward this. Especially on the spark side of the equation. I just can't get past the fact that 3 & 6 share a coil. It is just too convenient to be anything else in my mind. Especially since the misfires on 3 & 6 are pretty much equal. Within 10% I'd say. I'm seeing if I can find some diagrams for the PCM and ICM. I'll do some resistance checks and peel back some wire loom.

I'm thinking the control wire for the 3/6 coil is chafed and/or missing a bunch of strands somewhere. Enough remains that everything is fine at idle, but can't handle any kind of load like higher RPM. That's my current theory anyway. Probably won't know anything till next weekend. I only have time to mess with it between 60e builds. Gotta rake hay while the sun is shining.