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Have you done a compression test on the engine?
Would you please post the serial number of the engine?
Carb or EFI?
How is the fuel pressure on the engine?
Where the injectors cleaned when the engine was built?
How did the old plugs look?
This is the twin ECU engine correct?
You should be using the Champion QL77CC plugs. they are not surface gap.
With the serial number, I can tell you how to adjust the idle.
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