i have an issue i can’t find a solution for on all forms, i have a 05 Civic D17a2 with a Y8 manifold on, i have a rough idle when i turn my right signal a dead stop, it gets a little high idle and stays like that for about 25 seconds or more and my emergency brake light on the dash comes on any time i turn my right signal on, feels like it’s puslating a bit. I changed the flasher relay and fuel pump relay, brake fluid is till the top, no CEL on.

 

When ever you have lights on or AC on the engine has to work harder which will sometimes cause rough idle. Broken motor mounts help transmit the vibrations. Check them out or have them checked out.

Idk why you have the the emergency brake light come on when you use the flasher. Sounds like a bad ground. Let us know what the problem was when you figure this one out.

 

I concur with prodjay, bad ground or you have a incorrect wiring at the lights. Check to make sure you do not have any other strange behavior, for instance does the backup, brake and driving lights work also what happens when you press the brake and the turn signal this should lead you to the area where there is a wiring problem