loss of power and black smoke when trying to accelerate (anti-shudder flap closes while driving)

[mda]

Don't know if you can repair it, but I think you should go for option 2 if yan nga yung problema. That thing is probably there for a reason.

While searching for the part, may as well observe the car to see if the problem returns just to make sure that the solenoid valve is really the problem.