Well, I got the loaner throttle body installed tonight.

My butt-dyno reports that the car is performing better. The throttle responds much quicker and it seems like it has more power. I'll need to take it to the track to confirm, but I was squeaking tire a lot more than usual tonight while I drove it around.

Unfortunately, I got another P0505 and a P0507 check engine light while test driving it around. So I decided to disconnect my battery for about 45 minutes so that it would clear whatever the ECU had learned from my original throttle body. I drove it around some more, and I didn't get any CELs.

BUT... I did have idle issues. The car is idling high in park (about 2,000 rpm) and high in drive when stopped (about 700+ rpm). That is probably what is causing the P0507 CEL, but I don't know what is causing the P0505. Well, I should say the same thing is probably causing them, it's just that the P0507 is more obvious. I only got a P0507 once before, and that was at the Spring Dragon, just after I had installed the manis, catch can, and ECU tune.

Anyway, I'll drive it to work tomorrow and put some miles on it and see if the ECU relearns and corrects itself.