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I have a '03 Focus ZX3 2.3l manual that I recently bought and it supposedly didn't have codes and previous owner assured he never erased.
Anyway, I started getting both P2004 and P2008. It has a hard time starting up at times and other times it's fine. I'm not sure what to do. I tried replacing the intake manifold runner control solenoid. The two at the top of the engine, but it still had hard time starting up.
Some have recommended on changing the intake manifold runner control but the actuator not the solenoid. My dad suggested an intake cleaning which I'm considering since it'll be the cheapest option to try first. But my actual question is what's the best way to clean the intake?
 
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