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Try the higher octane gas.
White/blue smoke may be a sign of a real knock occurring. When you tested for continuity did you do it on the contact side of the pins. I have seen alot of bad contact pins on the ecu plugs as of late, where you get a good reading from the back, but a bad reading from the contact side. (steve injector?)
Timing was setup @ 1000rpm w/tps disconnected correct?
Do a compression (leak down if possible), just to double check the blue/white possibility of a chamber related failure.
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