Originally Posted by cchukan
It's normal. Mine did something similar and I read it on this forum somewhere that it's normal. As the RPM drops, it does a quick shutter with a weird noise, which I was told that one of the exhaust pipe is closing...
Yeah the weird noise of the exhaust flap opening I'm aware of but this was HPFP/misfire severe. Oh well, I'll see how it goes these next few mornings!