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Since you seem to be getting Spark and Momentum (Spark plugs are sparking and the starter is turning the engine), I would focus my efforts on Air and Fuel.
How's the air filter? Anything obstructing airflow into the engine? This just sounds similar to a problem I had when my air filter got all gummed up with some yucky road crud. Once it got it started, it ran great.
Some other ideas: When was the fuel filter last changed? How are the fuel injectors? They might be dirty. I'm not sure if the Si ones are the same, but if they are, you might try swapping them out.
How's the air filter? Anything obstructing airflow into the engine? This just sounds similar to a problem I had when my air filter got all gummed up with some yucky road crud. Once it got it started, it ran great.
Some other ideas: When was the fuel filter last changed? How are the fuel injectors? They might be dirty. I'm not sure if the Si ones are the same, but if they are, you might try swapping them out.