check engine light

So I've found out that if I pump my brakes while standing still for about 20 seconds, the check engine light will always come on. The code is P2004 and is something about an intake manifold runner flap being stuck open. Seems really odd to me. Nothing about the behaviour of the engine changes...

Hi gents, I have managed to swap our faulty automatic transmission to a manual on our 2.0 EX Accord. Everything went well, the swap was not too hard. We used the car for a couple of months, drove about 5k kms. The only problem is the CEL went on as expected due to the unplugged A/T connectors...