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interesting its the total 4 rear cylinders on two banks, and I know those two suck to get to in the rear on your car. Id disconnect the battery, unplug the ECU and clean they terminations at the ecu, and at the coil pack to harness, and coil harness to main harness connections. The LS coils have 4 wires Power 12V, Gate drive, ECU ground, and chassis ground. I would then put it together, put it in the on position and check voltage to both grounds at the 4 wire plug to the coil.
The other thing is your code can also sometimes be associated with crank position not learned, have you seen this code at all?
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