There isn't a problem with DAC3 tunes for DAC2 PCM.
Has it ever acted up without the chip?
Once it started missing, did it continue to miss until the chip was removed and run fine immediately afterwords?
Were all the files from the same family when you reburned the chip, ex. All VOAA7P6 tunes, and not a VOAA7P6 and something else?
My first gut reaction when reading the title of your thread was valve cover gasket(the connection though it). It could have happened to fail at the moment you flipped the switch. The connections on the valve cover gasket can be tempermental, running on all 8, miss for a while, then work perfectly again. There are two plugins, one for each bank, going into each valve cover. Maybe try putting some slight pressure on the plugin to see if either develops a miss, or if it acts up on you, try again to see if it clears up. I've done two valve cover gaskets in the past few weeks.
I see Dave posted about the CPS while I was typing this which is another good possibilty.
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Thomas H.
'97 F-250 CCSB 7.3L Auto, Gauges, Modded H2E, 285/200% sticks, 7.3L IC, Stealth Dual HPOP, Pheonix chip
'03 F-250 CCSB 6.0L Auto, Gryphon CTS, FICM tuning by PHP, Powermax
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