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Take it to a garage and have the do a smoke test. They send smoke through your system and wherever the leak is, you will see smoke coming out. Sometimes its something like a fuel injector... There's no way to find out.
You can also use propane and run it around the engine while its running and if the idle fluctuates, it gives you an idea of where it is.
Check your PCV hose for cracks, theyre known to crack overtime
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