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probably a failed UVCH

remove the oil cap and give it a sniff.... do you smell burnt wiring? If so it's the UVCH.

If you can get it running (may need to plug it in), while idling poorly disconnect one bank at a time. If you disconnect a bank and the engine keeps running....that's the bad harness. If you disconnect and the engine shuts off....thats the working harness.

The engine is trying to run on 4 cylinders when an UVCH fails.
 
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