Borrowed a Snap On Solus and pulled the freeze frame data. When the PCM throws a code, it also takes a snapshot of a bunch of PIDs. The Snap On will graciously show you these PIDs. I noticed that the evap code posted at 4 seconds of run time, exactly when the 5V reference signal code did. Now the evap code is constant, it never goes away, but the 5V reference code is intermittent. Because they both popped at the same instant I began to think perhaps they were somehow connected. The schematic doesn't indicate that, but they did come into existence at the same time. I'd never seen either code until I pulled codes after my last race. I removed the PCM pins and pulled the cover to have a look at the evap pin and ohm it end to end. What I found was a pin that was partially smooshed shut and on the PCM side it had shoved that pin in, which pushed it into another pin inside the PCM. None of it correlates to my problems, but an AC recirc door shorted to a camshaft position sensor wire and a TCC brake switch wire can't be good for business. I took the PCM apart, cleaned the corrosion from the case, ohmed the pin to verify it was making contact, and put it all back together. Tomorrow I'll go back out, solder in a new pin to the harness, reinstall PCM, clear codes, go for test drive. If they come back, I'll swap in a new evap solenoid that I have on hand. I'm beginning to wonder though if the thing it's looking for only rides on 98+ cans? You know, the one that mounts to the can? If that's the case I need to figure out how to smartly delete it because I'm not going through the asspain of swapping in a tank with a pressure sensor, especially seeing how I had one compatible today and just scrapped it.