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My 2003 ford focus is giving me a lean code. I replaced the o2 sensor and its still there. Maybe a manifold leak i sprayed it with carb cleaner and and it runs smoother at idle for a few seconds ant ideas?
 

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Sounds like you found the issue....

If spraying ANYTHING near the intake changes the engine's running, you have a leak to deal with...

Narrow it down & repair, your issue SHOULD be solved...

Luck!
 
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