[Jaynelly]

So I've never had any problems like this. My '13 STi just started stalling when it get to low RPM's. started after I had been driving fast for about an hour. Then I got to the city and stopped at my first light and it stalled. It continued to stall anytime I'd be going slow (5-10 mph). What's happening?! Thanks guys!

 

[XJman]

Could be the clutch not disengaging. Could be a vacuum leak.

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[Jaynelly]

It knocks loudly when it reaches 2.5-3 rpms and isn't really stalling when idle anymore

 

[XJman]

Does it knock when the transmission is in gear or also while the clutch pedal is depressed?

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[Jaynelly]

Only when I'm revving the engine

 

[Jaynelly]

Never mind, it knocks when it's stalled, just a different tone of knock

 

[XJman]

So it knocks in neutral when you rev it? You could have rod knock.

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[McBill]

So it makes an audible knocking noise between 2.5k-3k rpms. Have you checked your oil recently?