I'm working on a 2001 accord lx 5 speed. It has 274k and that stupid egr gremlins has come up. I've already pulled the plenum and gotten it spotless but didn't fix it. Next I'm going to do the valve. The plenum had about a quarter inch of buildup and took an entire can of carb cleaner. Umm also getting a misfire code that puzzles me as I have all new cap rotor plugs and wires. Any ideas?