MyE28.com

I recently adjusted my valves to .12/.030 when I had the valve cover off. Since then my idle speed has been kind of high and my engine has sounded different than before, but nothing serious like knocking or valve noise. Just different. I adjusted the valves where the cam lobes we're pointing up and then flipped it over to adjust the rest of the valves that had the lobes down. According to the repair guide sourced from this site, it says to adjust the valves at TDC and in firing order. Is this the correct way? I have never adjusted valves while the lobes are engaging the valves.

Also, is .12/.030 the standard? I've seen different figured on here.