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Jim,
The DDEC will assume that the air filter element is clean at idle. It adjusts only after it has received a power demand command. A momentary delayed inital adjustment period is standard. If the air filter element was installed improperly ( not fully unwrapped, foreign object in the cylinder) would explain a momentary shot of black smoke. Consistant black smoke is either bad fuel, misfireing injector or low compression.
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