Code 31 trouble

[vilant]

Was curious if anyone gets an intermittent Code 31?
I finally started to attack this problem in mine. My symptoms were: the code sets after just starting the car, I turn it off, clear the code, and it comes right back. Clear again, and it stays off for @20-30 min then sets again. Turn off the car, start it, and it's gone, then will come back again. A true intermittent. I followed the procedure in the FSM. Ruled out the ECM, and according the procedure I have a faulty cam sensor or faulty cam sensor connection. Bought a NOS one and cleaned up grounds points. The ground for the sensor is that fun one to get to behind and down from the center of the plenum. Cleaned the other 2 behind the battery while I was at it. Lightly sanded all parts and used De-Ox on all connections and added a lock washer (even scraped the paint off the frame on the lower ones). Re-seated all connectors on the ECM (even re-seated the PROM) and I still set a code intermittently. The only thing I can think of is the actual connector that connects sensor to the harness is bad. I tie wrapped the two halves of the connector together tight, which seemed to make it last longer between settings than usual, bit still sets. It's just annoying cause as soon as the SES light comes on, the secondaries won't come on (everything works normally, but it's like having the power key off). I got to turn the car off then on, or clear it to get full power again. I'll try re-pinning a new connector and if that doesn't work, then I'm completely stumped.
Anyone have any ideas? Would another sensor (there are several that are part of the same 10 amp fuse) be somehow interfering with the cam sensor?
Thanks, Joe